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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Genet.</journal-id>
<journal-title>Frontiers in Genetics</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Genet.</abbrev-journal-title>
<issn pub-type="epub">1664-8021</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">1183528</article-id>
<article-id pub-id-type="doi">10.3389/fgene.2023.1183528</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Genetics</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>
<italic>IL1RL1</italic> polymorphisms rs12479210 and rs1420101 are associated with increased lung cancer risk in the Chinese Han population</article-title>
<alt-title alt-title-type="left-running-head">Li et al.</alt-title>
<alt-title alt-title-type="right-running-head">
<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fgene.2023.1183528">10.3389/fgene.2023.1183528</ext-link>
</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Li</surname>
<given-names>Qi</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Zhang</surname>
<given-names>Chan</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Cheng</surname>
<given-names>Yujing</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Yang</surname>
<given-names>Xin</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/874938/overview"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Chen</surname>
<given-names>Wanlu</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>He</surname>
<given-names>Kunhua</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Chen</surname>
<given-names>Mingwei</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="corresp" rid="c001">&#x2a;</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1477741/overview"/>
</contrib>
</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>Department of Respiratory Medicine</institution>, <institution>The First Affiliated Hospital of School of Medicine of Xi&#x2019;an Jiaotong University</institution>, <addr-line>Xi&#x2019;an</addr-line>, <addr-line>Shaanxi</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Department of Blood Transfusion</institution>, <institution>The First People&#x2019;s Hospital of Yunnan Province</institution>, <institution>The Affiliated Hospital of Kunming University of Science and Technology</institution>, <addr-line>Kunming</addr-line>, <country>China</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Department of Blood Transfusion</institution>, <institution>Qujing No. 1 Hospital</institution>, <addr-line>Qujing</addr-line>, <country>China</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>
<bold>Edited by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/64369/overview">Anton A. Buzdin</ext-link>, European Organisation for Research and Treatment of Cancer, Belgium</p>
</fn>
<fn fn-type="edited-by">
<p>
<bold>Reviewed by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/1771076/overview">Itty Sethi</ext-link>, University of Jammu, India</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/566016/overview">Ramc&#xe9;s Falf&#xe1;n-Valencia</ext-link>, National Institute of Respiratory Diseases-Mexico (INER), Mexico</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/2406936/overview">Dongfang Tang</ext-link>, Fudan University, China</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Mingwei Chen, <email>mingwei__chen@163.com</email>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>31</day>
<month>08</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="collection">
<year>2023</year>
</pub-date>
<volume>14</volume>
<elocation-id>1183528</elocation-id>
<history>
<date date-type="received">
<day>10</day>
<month>03</month>
<year>2023</year>
</date>
<date date-type="accepted">
<day>17</day>
<month>08</month>
<year>2023</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2023 Li, Zhang, Cheng, Yang, Chen, He and Chen.</copyright-statement>
<copyright-year>2023</copyright-year>
<copyright-holder>Li, Zhang, Cheng, Yang, Chen, He and Chen</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<p>
<bold>Background:</bold> Lung cancer is one of the most common human malignant diseases. In this study, we aimed to explore the association between <italic>IL1RL1</italic> genetic polymorphisms and lung cancer risk in the Chinese Han population.</p>
<p>
<bold>Methods:</bold> We selected and genotyped six SNPs in the <italic>IL1RL1</italic> gene using the Agena MassARRAY system in 507 lung cancer patients and 507 healthy controls. The association between <italic>IL1RL1</italic> variants and lung cancer risk was assessed using logistic regression to calculate odds ratios (ORs) and 95% confidence intervals (CIs). Multi-factor dimensionality reduction (MDR) was used to analyze the impact of SNP-SNP interactions on the risk of lung cancer.</p>
<p>
<bold>Results:</bold> The results of overall analysis indicated that rs12479210 (T vs. C: OR &#x3d; 1.42, FDR-<italic>p</italic> &#x3d; 0.002; TC vs. CC: OR &#x3d; 1.70, FDR-<italic>p</italic> &#x3c; 0.0001; TT vs. CC: OR &#x3d; 1.77, FDR-<italic>p</italic> &#x3d; 0.032; TT-TC vs. CC: OR &#x3d; 1.71, FDR-<italic>p</italic> &#x3d; 0.001; additive: OR &#x3d; 1.44, FDR-<italic>p</italic> &#x3d; 0.001) and rs1420101 (T vs. C: OR &#x3d; 1.31, FDR-<italic>p</italic> &#x3d; 0.036; TT-TC vs. CC: OR &#x3d; 1.42, FDR-<italic>p</italic> &#x3d; 0.031; additive: OR &#x3d; 1.30, FDR-<italic>p</italic> &#x3d; 0.030) were associated with an increased the risk of lung cancer among the Chinese Han population. Stratified analysis also found the association between these two SNPs and lung cancer risk. However, there were no significant association observed between the other four SNPs (rs3771180, rs3771175, rs10208293, and rs10197862) in <italic>IL1RL1</italic> and lung cancer risk. Furthermore, MDR analysis showed that rs12479210 was the best single model with the highest testing accuracy (0.566) and perfect CVC (10/10) for predicting lung cancer risk. The expression level of the <italic>IL1RL1</italic> gene is lower in lung cancer tissue than normal tissue, and there are significant differences in the expression levels of <italic>IL1RL1</italic> between rs12479210 and rs1420101 genetypes in lung cancer tissue (<italic>p</italic> &#x3c; 0.05).</p>
<p>
<bold>Conclusion:</bold> Our findings suggest that <italic>IL1RL1</italic> genetic variants (rs12479210 and rs1420101) are associated with an increased lung cancer risk in the Chinese Han population. These risk variants may serve as biomarkers for the prevention and treatment of lung cancer.</p>
</abstract>
<kwd-group>
<kwd>IL1RL1</kwd>
<kwd>genetic</kwd>
<kwd>polymorphism</kwd>
<kwd>lung cancer</kwd>
<kwd>case-control study</kwd>
</kwd-group>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Cancer Genetics and Oncogenomics</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1">
<title>Introduction</title>
<p>The incidence and mortality rates of lung cancer are increasing globally (<xref ref-type="bibr" rid="B1">Bade and Dela Cruz, 2020</xref>). In 2020, lung cancer was the second most commonly diagnosed cancer and the leading cause of cancer death, with an estimated 2.2 million new cancer cases (11.4%) and 1.8 million deaths (18.0%) (<xref ref-type="bibr" rid="B24">Sung et al., 2021</xref>). The incidence and mortality rates of lung cancer are approximately two times higher in men than in women. In China, lung cancer is the leading cause of death in both males and females, with an estimated 870,982 new cases and 766,898 deaths expected in 2022 (<xref ref-type="bibr" rid="B32">Xia et al., 2022</xref>). Lung cancer is a complex pathological process influenced by multiple factors, including cigarette smoking, which is reported in about one-third of adults worldwide and has a strong relationship between cigarette smoke exposure and lung cancer has been proven (<xref ref-type="bibr" rid="B25">Taucher et al., 2022</xref>). Other nontobacco risk factors include poor diet, occupational exposures, air pollution, chronic lung disease, and lung infections (<xref ref-type="bibr" rid="B17">Malhotra et al., 2016</xref>; <xref ref-type="bibr" rid="B11">Huang et al., 2021</xref>; <xref ref-type="bibr" rid="B29">Wei et al., 2021</xref>; <xref ref-type="bibr" rid="B18">Moayedi-Nia et al., 2022</xref>). Despite recent advances in treatments, lung cancer remains a disease with a poor prognosis, and it is often not diagnosed until the cancer is at an advanced stage. Therefore, early diagnosis of lung cancer is crucial. Genetic factors have been shown to play a crucial role in the development of lung cancer. In a Spanish study describing the characteristics of female lung cancer patients, 42.5% of patients had a family history of tumors (<xref ref-type="bibr" rid="B8">Garrido et al., 2019</xref>). Single nucleotide polymorphisms (SNPs) of candidate genes have also been found to be associated with lung cancer risk (<xref ref-type="bibr" rid="B14">Khadhraoui et al., 2020</xref>; <xref ref-type="bibr" rid="B3">Chongtham et al., 2022</xref>; <xref ref-type="bibr" rid="B34">Zhang et al., 2022</xref>).</p>
<p>The Interleukin 1 receptor like 1 (<italic>IL1RL1</italic>) gene, also known as <italic>ST2</italic>, <italic>ST2L</italic>, and <italic>IL33R</italic>, encodes a protein that belongs to the family of IL1R, and it is only known ligand is <italic>IL-33</italic> (13). The <italic>IL-33</italic>/<italic>ST2L</italic> signal induces transcription of downstream inflammatory and anti-inflammatory genes by activating diverse intracellular kinases and factors to mount an adequate immune response (14). The <italic>IL-33</italic>/<italic>ST2</italic> axis affects tumor growth by regulating mitophagy in macrophages and reprogramming their polarization (15). Xu et al. (16) demonstrated that the <italic>IL33</italic>-<italic>IL1RL1</italic> pathway influenced tumor growth by regulating autophagy and reprogramming of macrophages. <italic>ST2</italic> was significantly downregulated in human lung cancer tissues and cells compared to normal lung tissues and cells (17). Furthermore, Wang et al. (18) showed that the <italic>IL33</italic>-<italic>IL1RL1</italic> signaling pathway is involved in the growth and metastasis of lung cancer. However, little is known about the correlation between <italic>IL1RL1</italic> polymorphisms and lung cancer.</p>
<p>Therefore, in this study we aimed to assess the possible association between six <italic>IL1RL1</italic> gene polymorphisms (rs12479210, rs3771180, rs1420101, rs3771175, rs10208293, and rs10197862) and susceptibility to lung cancer in the Chinese Han population. This research may provide a new biomarker for the prevention and development of lung cancer.</p>
</sec>
<sec sec-type="materials|methods" id="s2">
<title>Materials and methods</title>
<sec id="s2-1">
<title>Study population</title>
<p>The sample size of this study was estimated using G&#x2a;Power (3.1.9.7) software with the following parameters: tails &#x3d; two, effect size &#x3d; 0.2, <italic>a</italic> &#x3d; 0.05, power &#x3d; 0.889, and allocation ratio &#x3d; 1. A total of 1014 participants were randomly enrolled from Xuanwei city, including 507 newly histologically diagnosed lung cancer patients in the case group. Patients who underwent chemotherapy, surgery, radiotherapy, had other tumors or inflammatory diseases were excluded. The control group consisted of 507 healthy individuals recruited from medical examination centers, with no history of cancers, lung dysfunction, or related diseases. Basic information, such as age, gender, body mass index (BMI), smoking and drinking status, and clinical test indicators (tumor type and stage), were collected from questionnaires and clinical data.</p>
</sec>
<sec id="s2-2">
<title>SNPs selection and genotyping</title>
<p>First, we searched the physical location (2:102928023-102968497) of the <italic>IL1RL1</italic> gene (GRCh37. p13) through the NCBI database (<ext-link ext-link-type="uri" xlink:href="https://www.ncbi.nlm.nih.gov/gene/">https://www.ncbi.nlm.nih.gov/gene/</ext-link>). Second, we downloaded ped and info files of mutation sites in <italic>IL1RL1</italic> in the Chinese Han Beijing (CHB) population from 1000 Genome Project through VCF to PED Converter window (<ext-link ext-link-type="uri" xlink:href="http://grch37.ensembl.org/Homo">http://grch37.ensembl.org/Homo</ext-link> Sapiens/Tools/VcftoPed), and we used Haploview software to screen SNPs with Hardy-Weinberg equilibrium (HWE) &#x3e; 0.05, minor allele frequency (MAF) &#x3e; 0.05, and min genotype frequency &#x3e;75%, <italic>r</italic>
<sup>2</sup> &#x3e; 0.8. Finally, based on previous studies associated with respiratory diseases (<xref ref-type="bibr" rid="B7">Ferreira et al., 2011</xref>; <xref ref-type="bibr" rid="B21">Shrine et al., 2019</xref>; <xref ref-type="bibr" rid="B23">Sun et al., 2019</xref>; <xref ref-type="bibr" rid="B31">Wu et al., 2021</xref>; <xref ref-type="bibr" rid="B15">Li et al., 2022</xref>; <xref ref-type="bibr" rid="B19">Rojo-Tolosa et al., 2023</xref>) and primer design, a total of six SNPs in the <italic>IL1RL1</italic> gene were randomly selected (<xref ref-type="sec" rid="s12">Supplementary Table S1</xref>). The potential role of SNPs was predicted using RegulomeDB (<ext-link ext-link-type="uri" xlink:href="https://regulomedb.org/">https://regulomedb.org/</ext-link>), HaploReg (<ext-link ext-link-type="uri" xlink:href="https://pubs.broadinstitute.org/mammals/haploreg/haploreg.php">https://pubs.broadinstitute.org/mammals/haploreg/haploreg.php</ext-link>), and Genotype-Tissue Expression (GTEx) Portal databases (<ext-link ext-link-type="uri" xlink:href="https://gtexportal.org">https://gtexportal.org</ext-link>). Peripheral blood samples were collected from each subject, and genomic DNA was extracted using the GoldMag DNA extraction Kit (GoldMag Co. Ltd., Xi&#x2019;an, China) according to the manufacturer&#x2019;s instructions. The concentration and purity of DNA were measured by a spectrophotometer (NanoDrop 2000; Thermo Fisher Scientific, Waltham, MA, USA), with an OD260/OD280 ratio between 1.7 and 2.0 and a concentration greater than 20&#xa0;ng/&#x3bc;L. The primers for polymerase chain reaction (PCR) and unique base extension for the six SNPs in <italic>IL1RL1</italic> were designed by Agena Bioscience Assay Design Suite version 2.0 software and synthesized by Bioengineering (Shanghai Co., Ltd.). The primer sequence is shown in <xref ref-type="table" rid="T1">Table 1</xref>. Genotyping of <italic>IL1RL1</italic> variants was conducted by the Agena MassARRAY system (Agena Bioscience, San Diego, CA, USA), and data management and analysis were performed using AgenaTyper 4.0 software.</p>
<table-wrap id="T1" position="float">
<label>TABLE 1</label>
<caption>
<p>Primer sequences of PCR and unique base extension.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="left">SNP-ID</th>
<th align="left">1st-PCRP</th>
<th align="left">2nd-PCRP</th>
<th align="left">UEP-SEQ</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">rs12479210</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GTG&#x200b;TGG&#x200b;TAC&#x200b;AAC&#x200b;CAC&#x200b;TAA&#x200b;CTC</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GGG&#x200b;GAC&#x200b;TTC&#x200b;ATG&#x200b;TTA&#x200b;ATG&#x200b;GG</td>
<td align="left">TAA&#x200b;TGG&#x200b;GTA&#x200b;TGG&#x200b;GGT&#x200b;TAT&#x200b;ACT</td>
</tr>
<tr>
<td align="left">rs3771180</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GGG&#x200b;CCA&#x200b;AAT&#x200b;CTA&#x200b;TGA&#x200b;CTT&#x200b;GTT&#x200b;C</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GTT&#x200b;CCT&#x200b;CTC&#x200b;AAG&#x200b;GGA&#x200b;TTA&#x200b;CTC</td>
<td align="left">cAC&#x200b;ATC&#x200b;AAG&#x200b;AAT&#x200b;TCT&#x200b;TAG&#x200b;TAC&#x200b;ATG&#x200b;AT</td>
</tr>
<tr>
<td align="left">rs1420101</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GTT&#x200b;TGG&#x200b;TGT&#x200b;CAG&#x200b;AGT&#x200b;TTC&#x200b;TGC</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GGT&#x200b;ATA&#x200b;CCA&#x200b;TCA&#x200b;CAA&#x200b;AGC&#x200b;CTC</td>
<td align="left">cTC&#x200b;ACA&#x200b;AAG&#x200b;CCT&#x200b;CTC&#x200b;ATT&#x200b;A</td>
</tr>
<tr>
<td align="left">rs3771175</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GGA&#x200b;ACG&#x200b;GAC&#x200b;CAT&#x200b;GCT&#x200b;TAC&#x200b;AAC</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GGT&#x200b;GTC&#x200b;ACT&#x200b;GTA&#x200b;TGT&#x200b;GAA&#x200b;AGG</td>
<td align="left">ggg&#x200b;cAT&#x200b;GCA&#x200b;CCA&#x200b;ACA&#x200b;ACC&#x200b;G</td>
</tr>
<tr>
<td align="left">rs10208293</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GAG&#x200b;AGA&#x200b;AGA&#x200b;GTT&#x200b;CAC&#x200b;AAG&#x200b;GAG</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GAT&#x200b;CAC&#x200b;AAC&#x200b;TCC&#x200b;TGT&#x200b;GTT&#x200b;TGC</td>
<td align="left">act&#x200b;taA&#x200b;TAC&#x200b;ATT&#x200b;TAT&#x200b;GTC&#x200b;CAG&#x200b;TAC&#x200b;CT</td>
</tr>
<tr>
<td align="left">rs10197862</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GCT&#x200b;GGG&#x200b;AAT&#x200b;GCT&#x200b;AAT&#x200b;AGC&#x200b;CTC</td>
<td align="left">ACG&#x200b;TTG&#x200b;GAT&#x200b;GGA&#x200b;AGA&#x200b;AGA&#x200b;GAG&#x200b;CCT&#x200b;TGA&#x200b;GAG</td>
<td align="left">AAT&#x200b;TGT&#x200b;ATC&#x200b;TTT&#x200b;CAC&#x200b;AAG&#x200b;TCT&#x200b;C</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>SNP, single nucleotide polymorphism; 1st, frist; 2nd, second; PCRP, polymerase chain reaction primer; UEP-SEQ, unique base extension primer sequence.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s2-3">
<title>Bioinformatics analysis</title>
<p>The differences between six SNPs in <italic>IL1RL1</italic> and the expression level of <italic>IL1RL1</italic> in lung cancer tissues were analyzed using GTEx Portal database (<ext-link ext-link-type="uri" xlink:href="https://gtexportal.org/">https://gtexportal.org/</ext-link>). The expression level of <italic>IL1RL1</italic> in normal and lung adenocarcinoma (LUAD) and lung squamous cell carcinoma (LUSC) tissues was analyzed using GEPIA online analysis software based on TCGA database (<ext-link ext-link-type="uri" xlink:href="http://gepia.cancer-pku.cn/">http://gepia.cancer-pku.cn/</ext-link>). We predicted the signaling pathways involved in the <italic>IL1RL1</italic> gene through the PathCards database (<ext-link ext-link-type="uri" xlink:href="https://pathcards.genecards.org/">https://pathcards.genecards.org/</ext-link>).</p>
</sec>
<sec id="s2-4">
<title>Statistical analysis</title>
<p>Statistical analysis was performed using IBM SPSS software (version 25.0, SPSS Inc., Chicago, Illinois, USA) and PLINK software (version 1.07). The distribution of age and gender in the case and control group was evaluated using Student&#x2019;s t-test and Pearson&#x2019;s chi-square test, respectively. The <italic>p</italic>-value of HWE in controls was calculated by the chi-square test. The association between <italic>IL1RL1</italic> variants and lung cancer risk was assessed using odds ratio (OR) and 95% confidence interval (95% CI) calculated by logistic regression under multiple genetic models (allele, codominant, dominant, recessive, and additive). To reduce the influence of confounding factors (age, gender, and smoking status) on the statistical results, stratified analyses were performed, and forest plots of stratified results were drawn using Sangerbox software (version 3.0). The Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) values were calculated using SNPStats software to select the optimal model. False discovery rate (FDR) correction (q &#x3d; <italic>p</italic> &#x2a;(n/k); n is the total number of <italic>p</italic>-values; k is the order in which <italic>p</italic>-values are sorted from smallest to largest) was performed for <italic>p</italic>-values to reduce false positives in the results. The multifactor dimensionality reduction (MDR) method was used to further evaluate the effect of SNP-SNP interactions on lung cancer risk by MDR 3.0.2 software. To determine the reliability of significant correlation results, statistical power and false positive report probability (FPRP) values of SNPs were calculated using the Excel spreadsheet offered on Wacholder&#x2019;s website (<xref ref-type="bibr" rid="B27">Wacholder et al., 2004</xref>). All statistical analyses were two-sided, and <italic>p</italic> &#x3c; 0.05 was considered statistically significant.</p>
</sec>
</sec>
<sec sec-type="results" id="s3">
<title>Results</title>
<sec id="s3-1">
<title>Participant characteristics</title>
<p>
<xref ref-type="table" rid="T2">Table 2</xref> describes the basic characteristics of the study participants. This study included 507 patients diagnosed with lung cancer (average age: 61.12 &#xb1; 10.03&#xa0;years, 350 males and 157 females) and 507 healthy controls (average age: 60.97 &#xb1; 9.25&#xa0;years, 349 males and 158 females). The results showed that the control and case groups were well-matched in terms of age (<italic>p</italic> &#x3d; 0.810) and gender (<italic>p</italic> &#x3d; 0.946) distribution. However, there were significant differences in the distribution of BMI, smoking, and alcohol consumption between the case group and the control group (<italic>p &#x3c;</italic> 0.05). Therefore, in order to reduce the impact of these confounding factors on association analysis results, we conducted correction and stratified analysis.</p>
<table-wrap id="T2" position="float">
<label>TABLE 2</label>
<caption>
<p>Basic characteristics of participants.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th colspan="2" align="center">Variables</th>
<th align="center">Cases (n &#x3d; 507)</th>
<th align="center">Control (n &#x3d; 507)</th>
<th align="center">
<italic>p</italic>-value</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td rowspan="3" align="left">Age (years)</td>
<td align="left">Mean &#xb1; SD</td>
<td align="center">61.12 &#xb1; 10.03</td>
<td align="center">60.97 &#xb1; 9.25</td>
<td align="center">0.810</td>
</tr>
<tr>
<td align="left">&#x3e;60</td>
<td align="center">280 (55.2%)</td>
<td align="center">295 (58.2%)</td>
<td align="center">0.342</td>
</tr>
<tr>
<td align="left">&#x2264;60</td>
<td align="center">227 (44.8%)</td>
<td align="center">212 (41.8%)</td>
<td align="left"/>
</tr>
<tr>
<td rowspan="2" align="left">Gender</td>
<td align="left">Male</td>
<td align="center">350 (69.0%)</td>
<td align="center">349 (68.8%)</td>
<td align="center">0.946</td>
</tr>
<tr>
<td align="left">Female</td>
<td align="center">157 (31.0%)</td>
<td align="center">158 (31.2%)</td>
<td align="left"/>
</tr>
<tr>
<td rowspan="4" align="left">BMI (kg/m2)</td>
<td align="left">Mean &#xb1; SD</td>
<td align="center">22.79 &#xb1; 3.47</td>
<td align="center">24.15 &#xb1; 3.07</td>
<td align="left"/>
</tr>
<tr>
<td align="left">&#x3e;24</td>
<td align="center">139 (27.4%)</td>
<td align="center">146 (28.8%)</td>
<td align="center">&#x3c;0.001</td>
</tr>
<tr>
<td align="left">&#x2264;24</td>
<td align="center">355 (70.0%)</td>
<td align="center">189 (37.3%)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">Missing</td>
<td align="center">13 (2.6%)</td>
<td align="center">172 (33.9%)</td>
<td align="left"/>
</tr>
<tr>
<td rowspan="3" align="left">Drinking</td>
<td align="left">Yes</td>
<td align="center">113 (22.3%)</td>
<td align="center">118 (23.3%)</td>
<td align="center">&#x3c;0.001</td>
</tr>
<tr>
<td align="left">No</td>
<td align="center">357 (70.4%)</td>
<td align="center">174 (34.3%)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">Missing</td>
<td align="center">37 (7.3%)</td>
<td align="center">215 (42.4%)</td>
<td align="left"/>
</tr>
<tr>
<td rowspan="3" align="left">Smoking</td>
<td align="left">Yes</td>
<td align="center">251 (49.5%)</td>
<td align="center">129 (25.4%)</td>
<td align="center">&#x3c;0.001</td>
</tr>
<tr>
<td align="left">No</td>
<td align="center">250 (49.3%)</td>
<td align="center">189 (37.3%)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">Missing</td>
<td align="center">6 (1.2%)</td>
<td align="center">189 (37.3%)</td>
<td align="left"/>
</tr>
<tr>
<td rowspan="4" align="left">Types of LC</td>
<td align="left">SCLC</td>
<td align="center">58 (11.4%)</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left">SCC</td>
<td align="center">137 (27.0%)</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left">Adenocarcinoma</td>
<td align="center">189 (37.3%)</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left">Missing</td>
<td align="center">123 (24.3%)</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td rowspan="3" align="left">Tumor stage</td>
<td align="left">I-II</td>
<td align="center">88 (20.0%)</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left">III-IV</td>
<td align="center">277 (54.6%)</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left">Missing</td>
<td align="center">142 (25.4%)</td>
<td align="left"/>
<td align="left"/>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>SD, standard deviation; BMI, body mass index; SCC, squamous cell carcinoma; SCLC, small cell lung cancer.</p>
</fn>
<fn>
<p>
<italic>p</italic>-value was calculated by Student&#x2019;s t-test for age and <italic>&#x3c7;</italic>
<sup>2</sup> For gender.</p>
</fn>
<fn>
<p>
<italic>p</italic> &#x3c; 0.05 indicates statistical significance.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s3-2">
<title>Basic information of SNPs in <italic>IL1RL1</italic>
</title>
<p>This research selected six SNPs (rs12479210, rs3771180, rs1420101, rs3771175, rs10208293, and rs10197862) in the <italic>IL1RL1</italic> gene as candidate SNPs. As shown in <xref ref-type="table" rid="T3">Table 3</xref>, rs3771175 is located in the 3&#x2032;-UTR of <italic>IL1RL1</italic> gene, and the rest loci are located in the intron region. RegulomeDB and HaploReg analysis predicted the potential functions of these SNPs. The call rates of all SNPs genotype were greater than 95%, and were consistent with HWE, indicating that our samples satisfied random distribution and the SNP genotyping technique was reliable (<italic>p</italic> &#x3e; 0.05, <xref ref-type="table" rid="T3">Table 3</xref>).</p>
<table-wrap id="T3" position="float">
<label>TABLE 3</label>
<caption>
<p>Basic information and HWE of six SNPs in <italic>IL1RL1</italic>.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">SNP-ID</th>
<th align="center">Chr</th>
<th align="center">Position</th>
<th align="center">Functional consequence</th>
<th align="center">Allele (A/B)</th>
<th align="center">MAFcase</th>
<th align="center">MAF control</th>
<th align="center">HWE-<italic>p</italic>
</th>
<th align="center">RegulomeDB rank</th>
<th align="center">
<ext-link ext-link-type="uri" xlink:href="https://www.so.com/link?m=zXbyDO+5NVWrJ650+Yp77gDfhjAFb2GmyRDUZvc1g886aUTeRHDth9GJyTDfTBlTEykSvJVjvonI/ZFXMJav5NS1/odCsjjic0z9NCjkN5QOVqLYS7gludyiYT49ZhSmvFzwmI3fd3RWqFyk+F8wAPLk9Af+sz/w5">HaploReg</ext-link>
</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">rs12479210</td>
<td align="center">2</td>
<td align="center">102332701</td>
<td align="center">Intron</td>
<td align="center">T/C</td>
<td align="center">0.389</td>
<td align="center">0.309</td>
<td align="center">0.754</td>
<td align="left">Other</td>
<td align="left">Motifs changed; GRASP QTLhits; Selected eQTL hits</td>
</tr>
<tr>
<td align="left">rs3771180</td>
<td align="center">2</td>
<td align="center">102337157</td>
<td align="center">Intron</td>
<td align="center">T/G</td>
<td align="center">0.084</td>
<td align="center">0.091</td>
<td align="center">0.592</td>
<td align="left">TF binding &#x2b; any motif &#x2b; DNase Footprint &#x2b; DNase peak</td>
<td align="left">Promoter histone marks; Enhancer histone marks; DNAse; Proteins bound; Motifs changed; NHGRI/EBI GWAS hits; GRASP QTL hits; Selected eQTL hits</td>
</tr>
<tr>
<td align="left">rs1420101</td>
<td align="center">2</td>
<td align="center">102341256</td>
<td align="center">Intron</td>
<td align="center">T/C</td>
<td align="center">0.369</td>
<td align="center">0.309</td>
<td align="center">0.349</td>
<td align="left">TF binding &#x2b; any motif &#x2b; DNase peak</td>
<td align="left">Enhancer histone marks; Motifs changed; NHGRI/EBI GWAS hits; GRASP QTL hits; Selected eQTL hits</td>
</tr>
<tr>
<td align="left">rs3771175</td>
<td align="center">2</td>
<td align="center">102343750</td>
<td align="center">3&#x2032;-UTR</td>
<td align="center">A/T</td>
<td align="center">0.078</td>
<td align="center">0.079</td>
<td align="center">0.540</td>
<td align="left">TF binding &#x2b; DNase peak</td>
<td align="left">Enhancer histone marks; Motifs changed; NHGRI/EBI GWAS hits; GRASP QTL hits; Selected eQTL hits</td>
</tr>
<tr>
<td align="left">rs10208293</td>
<td align="center">2</td>
<td align="center">102349850</td>
<td align="center">Intron</td>
<td align="center">A/G</td>
<td align="center">0.134</td>
<td align="center">0.139</td>
<td align="center">0.854</td>
<td align="left">Other</td>
<td align="left">Enhancer histone marks; Selected eQTL hits</td>
</tr>
<tr>
<td align="left">rs10197862</td>
<td align="center">2</td>
<td align="center">102350089</td>
<td align="center">Intron</td>
<td align="center">G/A</td>
<td align="center">0.088</td>
<td align="center">0.091</td>
<td align="center">0.587</td>
<td align="left">TF binding or DNase peak</td>
<td align="left">NHGRI/EBI GWAS hits; GRASP QTL hits; Selected eQTL hits</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>SNP, single nueleotide polymorphism; Chr, Chromosome; MAF, minor allele frequency; HWE, hardy-weinberg equilibrium; eQTL, expression quantitative trait locus; QTL, quantitative trait locus; TF, transcription factor; GRASP, genome-wide repository of associations between SNPs, and phenotypes; NHGRI, national human genome research institute; EBI, european bioinformatics institute; GWAS, genome-wide association study.</p>
</fn>
<fn>
<p>
<italic>p</italic> &#x3c; 0.05 indicates statistical significance.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s3-3">
<title>Association between <italic>IL1RL1</italic> polymorphisms and lung cancer risk (overall analysis)</title>
<p>
<xref ref-type="table" rid="T4">Table 4</xref> presents the correlation between <italic>IL1RL1</italic> variants and lung cancer susceptibility in multiple genetic models. The results showed that rs12479210 was associated with an increased risk of lung cancer under the allele (T vs. C: OR &#x3d; 1.42, 95% CI: 1.18-1.71, <italic>p</italic> &#x3d; 0.0001, FDR-<italic>p</italic> &#x3d; 0.002), codominant (TC vs. CC: OR &#x3d; 1.70, 95% CI: 1.30-2.22, <italic>p</italic> &#x3c; 0.0001, FDR-<italic>p</italic> &#x3c; 0.0001; TT vs. CC: OR &#x3d; 1.77, 95% CI: 1.17-2.69, <italic>p</italic> &#x3d; 0.007, FDR-<italic>p</italic> &#x3d; 0.032), dominant (TT-TC vs. CC: OR &#x3d; 1.71, 95% CI: 1.33-2.21, <italic>p</italic> &#x3d; 0.0001, FDR-<italic>p</italic> &#x3d; 0.001), and additive models (OR &#x3d; 1.44, 95% CI: 1.20-1.75, <italic>p</italic> &#x3d; 0.0001, FDR-<italic>p</italic> &#x3d; 0.001). The dominant model was the optimal model for rs12479210 with the minimum AIC (1393.2) and BIC (1412.9) values. Additionally, rs1420101 was significantly associated with an increased risk of lung cancer under the allele (T vs. C: OR &#x3d; 1.31, 95% CI: 1.09-1.57, <italic>p</italic> &#x3d; 0.005, FDR-<italic>p</italic> &#x3d; 0.036), dominant (TT-TC vs. CC: OR &#x3d; 1.42, 95% CI: 1.10-1.82, <italic>p</italic> &#x3d; 0.006, FDR-<italic>p</italic> &#x3d; 0.031), and additive models (OR &#x3d; 1.30, 95% CI: 1.08-1.56, <italic>p</italic> &#x3d; 0.005, FDR-<italic>p</italic> &#x3d; 0.030). The additive model was the optimal model for rs1420101 with the minimum AIC (1404.5) and BIC (1424.1) values. Furthermore, the statistical power and FPRP of rs12479210 and rs1420101 were analyzed under multiple genetic models (<xref ref-type="table" rid="T5">Table 5</xref>), and the results showed that the correlation between these two SNPs and lung cancer risk was reliable. However, there were no significant differences between the other four SNPs (rs3771180, rs3771175, rs10208293, and rs10197862) in <italic>IL1RL1</italic> and lung cancer risk.</p>
<table-wrap id="T4" position="float">
<label>TABLE 4</label>
<caption>
<p>Associations between <italic>IL1RL1</italic> polymorphisms and LC risk under multiple genetic models.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">SNP-ID</th>
<th align="center">Model</th>
<th align="center">Genotype</th>
<th align="center">Case (%)</th>
<th align="center">Control (%)</th>
<th align="center">OR (95% CI)</th>
<th align="center">
<italic>p</italic>
</th>
<th align="center">FDR-<italic>p</italic>
</th>
<th align="center">AIC</th>
<th align="center">BIC</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">rs12479210</td>
<td align="left">Allele</td>
<td align="left">C</td>
<td align="left">620 (61.1)</td>
<td align="left">698 (69.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">T</td>
<td align="left">394 (38.9)</td>
<td align="left">312 (30.9)</td>
<td align="center">1.42 (1.18&#x2013;1.71)</td>
<td align="center">0.0001</td>
<td align="center">0.002</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Codominant</td>
<td align="left">CC</td>
<td align="left">178 (35.1)</td>
<td align="left">243 (48.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1395.2</td>
<td align="center">1419.8</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TC</td>
<td align="left">264 (52.1)</td>
<td align="left">212 (42)</td>
<td align="center">1.70 (1.30&#x2013;2.22)</td>
<td align="center">&#x3c;0.0001</td>
<td align="center">&#x3c;0.0001</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT</td>
<td align="left">65 (12.8)</td>
<td align="left">50 (9.9)</td>
<td align="center">1.77 (1.17&#x2013;2.69)</td>
<td align="center">0.007</td>
<td align="center">0.032</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Dominant</td>
<td align="left">CC</td>
<td align="left">178 (35.1)</td>
<td align="left">243 (48.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1393.2</td>
<td align="center">1412.9</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT-TC</td>
<td align="left">329 (64.9)</td>
<td align="left">262 (51.9)</td>
<td align="center">1.71 (1.33&#x2013;2.21)</td>
<td align="center">0.0001</td>
<td align="center">0.001</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Recessive</td>
<td align="left">TC-CC</td>
<td align="left">442 (87.2)</td>
<td align="left">455 (90.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1408.7</td>
<td align="center">1428.4</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT</td>
<td align="left">65 (12.8)</td>
<td align="left">50 (9.9)</td>
<td align="center">1.34 (0.90&#x2013;1.98)</td>
<td align="center">0.144</td>
<td align="center">0.432</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Additive</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="center">1.44 (1.20&#x2013;1.75)</td>
<td align="center">0.0001</td>
<td align="center">0.001</td>
<td align="center">1396.2</td>
<td align="center">1415.8</td>
</tr>
<tr>
<td align="left">rs3771180</td>
<td align="left">Allele</td>
<td align="left">G</td>
<td align="left">929 (91.6)</td>
<td align="left">918 (90.9)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">T</td>
<td align="left">85 (8.4)</td>
<td align="left">92 (9.1)</td>
<td align="center">0.91 (0.67&#x2013;1.24)</td>
<td align="center">0.563</td>
<td align="center">0.965</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Codominant</td>
<td align="left">GG</td>
<td align="left">424 (83.6)</td>
<td align="left">418 (82.8)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1411.5</td>
<td align="center">1436.1</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TG</td>
<td align="left">81 (16)</td>
<td align="left">82 (16.2)</td>
<td align="center">0.98 (0.70&#x2013;1.37)</td>
<td align="center">0.887</td>
<td align="center">1.101</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT</td>
<td align="left">2 (0.4)</td>
<td align="left">5 1)</td>
<td align="center">0.39 (0.08&#x2013;2.03)</td>
<td align="center">0.264</td>
<td align="center">0.731</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Dominant</td>
<td align="left">GG</td>
<td align="left">424 (83.6)</td>
<td align="left">418 (82.8)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1410.7</td>
<td align="center">1430.4</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT-TG</td>
<td align="left">83 (16.4)</td>
<td align="left">87 (17.2)</td>
<td align="center">0.94 (0.68&#x2013;1.31)</td>
<td align="center">0.723</td>
<td align="center">1.085</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Recessive</td>
<td align="left">TG-GG</td>
<td align="left">505 (99.6)</td>
<td align="left">500 (99)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1409.5</td>
<td align="center">1429.2</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT</td>
<td align="left">2 (0.4)</td>
<td align="left">5 1)</td>
<td align="center">0.39 (0.08&#x2013;2.04)</td>
<td align="center">0.266</td>
<td align="center">0.684</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Additive</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="center">0.91 (0.67&#x2013;1.25)</td>
<td align="center">0.566</td>
<td align="center">0.926</td>
<td align="center">1410.5</td>
<td align="center">1430.2</td>
</tr>
<tr>
<td align="left">rs1420101</td>
<td align="left">Allele</td>
<td align="left">C</td>
<td align="left">640 (63.1)</td>
<td align="left">699 (69.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">T</td>
<td align="left">374 (36.9)</td>
<td align="left">313 (30.9)</td>
<td align="center">1.31 (1.09&#x2013;1.57)</td>
<td align="center">0.005</td>
<td align="center">0.036</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Codominant</td>
<td align="left">CC</td>
<td align="left">203 (40)</td>
<td align="left">246 (48.6)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1406.1</td>
<td align="center">1430.7</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TC</td>
<td align="left">234 (46.2)</td>
<td align="left">207 (40.9)</td>
<td align="center">1.37 (1.05&#x2013;1.78)</td>
<td align="center">0.020</td>
<td align="center">0.080</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT</td>
<td align="left">70 (13.8)</td>
<td align="left">53 (10.5)</td>
<td align="center">1.60 (1.07&#x2013;2.39)</td>
<td align="center">0.022</td>
<td align="center">0.079</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Dominant</td>
<td align="left">CC</td>
<td align="left">203 (40)</td>
<td align="left">246 (48.6)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1404.7</td>
<td align="center">1424.4</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT-TC</td>
<td align="left">304 (60)</td>
<td align="left">260 (51.4)</td>
<td align="center">1.42 (1.10&#x2013;1.82)</td>
<td align="center">0.006</td>
<td align="center">0.031</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Recessive</td>
<td align="left">TC-CC</td>
<td align="left">437 (86.2)</td>
<td align="left">453 (89.5)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1409.6</td>
<td align="center">1429.3</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">TT</td>
<td align="left">70 (13.8)</td>
<td align="left">53 (10.5)</td>
<td align="center">1.37 (0.94&#x2013;2.00)</td>
<td align="center">0.105</td>
<td align="center">0.344</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Additive</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="center">1.30 (1.08&#x2013;1.56)</td>
<td align="center">0.005</td>
<td align="center">0.030</td>
<td align="center">1404.5</td>
<td align="center">1424.1</td>
</tr>
<tr>
<td align="left">rs3771175</td>
<td align="left">Allele</td>
<td align="left">T</td>
<td align="left">935 (92.2)</td>
<td align="left">932 (92.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">A</td>
<td align="left">79 (7.8)</td>
<td align="left">80 (7.9)</td>
<td align="center">0.98 (0.71&#x2013;1.36)</td>
<td align="center">0.924</td>
<td align="center">1.040</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Codominant</td>
<td align="left">TT</td>
<td align="left">430 (84.8)</td>
<td align="left">430 (85)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1413.5</td>
<td align="center">1438.1</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">AT</td>
<td align="left">75 (14.8)</td>
<td align="left">72 (14.2)</td>
<td align="center">1.04 (0.74&#x2013;1.48)</td>
<td align="center">0.810</td>
<td align="center">1.122</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">AA</td>
<td align="left">2 (0.4)</td>
<td align="left">4 (0.8)</td>
<td align="center">0.50 (0.09&#x2013;2.74)</td>
<td align="center">0.422</td>
<td align="center">0.844</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Dominant</td>
<td align="left">TT</td>
<td align="left">430 (84.8)</td>
<td align="left">430 (85)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1412.2</td>
<td align="center">1431.9</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">AA-AT</td>
<td align="left">77 (15.2)</td>
<td align="left">76 (15)</td>
<td align="center">1.02 (0.72&#x2013;1.43)</td>
<td align="center">0.932</td>
<td align="center">0.959</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Recessive</td>
<td align="left">AT-TT</td>
<td align="left">505 (99.6)</td>
<td align="left">502 (99.2)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1411.6</td>
<td align="center">1431.2</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">AA</td>
<td align="left">2 (0.4)</td>
<td align="left">4 (0.8)</td>
<td align="center">0.49 (0.09&#x2013;2.72)</td>
<td align="center">0.418</td>
<td align="center">0.885</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Additive</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="center">0.99 (0.71&#x2013;1.36)</td>
<td align="center">0.931</td>
<td align="center">1.016</td>
<td align="center">1412.2</td>
<td align="center">1431.9</td>
</tr>
<tr>
<td align="left">rs10208293</td>
<td align="left">Allele</td>
<td align="left">G</td>
<td align="left">878 (86.6)</td>
<td align="left">864 (86.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">A</td>
<td align="left">136 (13.4)</td>
<td align="left">140 (13.9)</td>
<td align="center">0.96 (0.74&#x2013;1.23)</td>
<td align="center">0.728</td>
<td align="center">1.048</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Codominant</td>
<td align="left">GG</td>
<td align="left">377 (74.4)</td>
<td align="left">372 (74.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1407.5</td>
<td align="center">1432.1</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">AG</td>
<td align="left">124 (24.5)</td>
<td align="left">120 (23.9)</td>
<td align="center">1.02 (0.76&#x2013;1.36)</td>
<td align="center">0.897</td>
<td align="center">1.076</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">AA</td>
<td align="left">6 (1.2)</td>
<td align="left">10 2)</td>
<td align="center">0.59 (0.21&#x2013;1.63)</td>
<td align="center">0.306</td>
<td align="center">0.689</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Dominant</td>
<td align="left">GG</td>
<td align="left">377 (74.4)</td>
<td align="left">372 (74.1)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1406.6</td>
<td align="center">1426.3</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">AA-AG</td>
<td align="left">130 (25.6)</td>
<td align="left">130 (25.9)</td>
<td align="center">0.99 (0.74&#x2013;1.31)</td>
<td align="center">0.921</td>
<td align="center">1.070</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Recessive</td>
<td align="left">AG-GG</td>
<td align="left">501 (98.8)</td>
<td align="left">492 (98)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1405.5</td>
<td align="center">1425.2</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">AA</td>
<td align="left">6 (1.2)</td>
<td align="left">10 2)</td>
<td align="center">0.58 (0.21&#x2013;1.62)</td>
<td align="center">0.301</td>
<td align="center">0.722</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Additive</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="center">0.95 (0.74&#x2013;1.23)</td>
<td align="center">0.717</td>
<td align="center">1.122</td>
<td align="center">1406.5</td>
<td align="center">1426.1</td>
</tr>
<tr>
<td align="left">rs10197862</td>
<td align="left">Allele</td>
<td align="left">A</td>
<td align="left">925 (91.2)</td>
<td align="left">913 (90.9)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">G</td>
<td align="left">89 (8.8)</td>
<td align="left">91 (9.1)</td>
<td align="center">0.97 (0.71&#x2013;1.31)</td>
<td align="center">0.821</td>
<td align="center">1.095</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Codominant</td>
<td align="left">AA</td>
<td align="left">421 (83)</td>
<td align="left">416 (82.9)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1408.1</td>
<td align="center">1432.7</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">GA</td>
<td align="left">83 (16.4)</td>
<td align="left">81 (16.1)</td>
<td align="center">1.02 (0.73&#x2013;1.42)</td>
<td align="center">0.931</td>
<td align="center">0.986</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">GG</td>
<td align="left">3 (0.6)</td>
<td align="left">5 1)</td>
<td align="center">0.59 (0.14&#x2013;2.49)</td>
<td align="center">0.473</td>
<td align="center">0.851</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Dominant</td>
<td align="left">AA</td>
<td align="left">421 (83)</td>
<td align="left">416 (82.9)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1406.7</td>
<td align="center">1426.3</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">GG-GA</td>
<td align="left">86 (17)</td>
<td align="left">86 (17.1)</td>
<td align="center">0.99 (0.71&#x2013;1.38)</td>
<td align="center">0.953</td>
<td align="center">0.953</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Recessive</td>
<td align="left">AA-GA</td>
<td align="left">504 (99.4)</td>
<td align="left">497 (99)</td>
<td align="center">1</td>
<td align="left"/>
<td align="left"/>
<td align="center">1406.1</td>
<td align="center">1425.8</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="left">GG</td>
<td align="left">3 (0.6)</td>
<td align="left">5 1)</td>
<td align="center">0.59 (0.14&#x2013;2.48)</td>
<td align="center">0.471</td>
<td align="center">0.892</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left"/>
<td align="left">Additive</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="left">---</td>
<td align="center">0.97 (0.71&#x2013;1.31)</td>
<td align="center">0.830</td>
<td align="center">1.067</td>
<td align="center">1406.6</td>
<td align="center">1426.3</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>LC, lung cancer; SNP, single nucleotide polymorphism; OR, odds ratio; CI, confidence interval; FDR, false discovery rate AIC, akaike information criterion; BIC, Bayesian Information Criterion.</p>
</fn>
<fn>
<p>OR, and 95% CI, were calculated using logistic regression adjusted with age and gender.</p>
</fn>
<fn>
<p>
<italic>p</italic> &#x3c; 0.05 indicate statistical significance.</p>
</fn>
</table-wrap-foot>
</table-wrap>
<table-wrap id="T5" position="float">
<label>TABLE 5</label>
<caption>
<p>FPRP of the association <italic>IL1RL1</italic> polymorphisms and LC risk.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th rowspan="2" align="center">SNP-ID</th>
<th rowspan="2" align="center">Model</th>
<th rowspan="2" align="center">Statistical power</th>
<th colspan="5" align="center">Prior probability</th>
</tr>
<tr>
<th align="center">0.25 (b)</th>
<th align="center">0.1 (b)</th>
<th align="center">0.01</th>
<th align="center">0.001</th>
<th align="center">0.0001</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">rs12479210</td>
<td align="left">Allele</td>
<td align="center">0.718</td>
<td align="center">0.001</td>
<td align="center">0.003</td>
<td align="center">0.029<sup>b</sup>
</td>
<td align="center">0.232</td>
<td align="center">0.751</td>
</tr>
<tr>
<td align="left"/>
<td align="left">Homozygote</td>
<td align="center">0.716</td>
<td align="center">0.030</td>
<td align="center">0.086</td>
<td align="center">0.509</td>
<td align="center">0.913</td>
<td align="center">0.991</td>
</tr>
<tr>
<td align="left"/>
<td align="left">Heterozygote</td>
<td align="center">0.884</td>
<td align="center">0.000</td>
<td align="center">0.001</td>
<td align="center">0.011<sup>b</sup>
</td>
<td align="center">0.099<sup>b</sup>
</td>
<td align="center">0.524</td>
</tr>
<tr>
<td align="left"/>
<td align="left">Dominant</td>
<td align="center">0.884</td>
<td align="center">0.000</td>
<td align="center">0.000</td>
<td align="center">0.005<sup>b</sup>
</td>
<td align="center">0.045<sup>b</sup>
</td>
<td align="center">0.319</td>
</tr>
<tr>
<td align="left"/>
<td align="left">Additive</td>
<td align="center">1.000</td>
<td align="center">0.001</td>
<td align="center">0.002</td>
<td align="center">0.024<sup>b</sup>
</td>
<td align="center">0.198<sup>b</sup>
</td>
<td align="center">0.712</td>
</tr>
<tr>
<td align="left">rs1420101</td>
<td align="left">Allele</td>
<td align="center">0.929</td>
<td align="center">0.011</td>
<td align="center">0.032</td>
<td align="center">0.270</td>
<td align="center">0.788</td>
<td align="center">0.974</td>
</tr>
<tr>
<td align="left"/>
<td align="left">Homozygote</td>
<td align="center">0.862</td>
<td align="center">0.070</td>
<td align="center">0.185</td>
<td align="center">0.714</td>
<td align="center">0.962</td>
<td align="center">0.996</td>
</tr>
<tr>
<td align="left"/>
<td align="left">Heterozygote</td>
<td align="center">0.998</td>
<td align="center">0.053</td>
<td align="center">0.143</td>
<td align="center">0.647</td>
<td align="center">0.949</td>
<td align="center">0.995</td>
</tr>
<tr>
<td align="left"/>
<td align="left">Dominant</td>
<td align="center">0.997</td>
<td align="center">0.017</td>
<td align="center">0.048</td>
<td align="center">0.358</td>
<td align="center">0.849</td>
<td align="center">0.983</td>
</tr>
<tr>
<td align="left"/>
<td align="left">Additive</td>
<td align="center">0.938</td>
<td align="center">0.015</td>
<td align="center">0.044</td>
<td align="center">0.336</td>
<td align="center">0.836</td>
<td align="center">0.981</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>FPRP, false positive report probability; SNP, single nucleotide polymorphism; OR, odds ratio; CI, confidence interval.</p>
</fn>
<fn>
<p>The level of false positive report probability threshold was set at 0.2 and noteworthy findings are presented.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s3-4">
<title>Stratified analysis of the association between <italic>IL1RL1</italic> SNPs and lung cancer risk</title>
<p>To reduce the impact of confounding factors on the analysis results, we conducted stratified analysis based on mean age (&#x3e;60 and &#x2264;60), gender (male and female), and smoking status (yes and no). Gender stratified analysis (<xref ref-type="fig" rid="F1">Figure 1</xref> and <xref ref-type="sec" rid="s12">Supplementary Table S2</xref>) showed that rs12479210 (T vs. C: OR &#x3d; 1.49, 95% CI: 1.20-1.86, <italic>p</italic> &#x3c; 0.0001, FDR-<italic>p</italic> &#x3d; 0.007; CT vs. CC: OR &#x3d; 1.62, 95% CI: 1.18-2.23, <italic>p</italic> &#x3d; 0.003, FDR-<italic>p</italic> &#x3d; 0.021; TT vs. CC: OR &#x3d; 2.20, 95% CI: 1.31-3.70, <italic>p</italic> &#x3d; 0.003, FDR-<italic>p</italic> &#x3d; 0.026; CT-TT vs. CC: OR &#x3d; 1.71, 95% CI: 1.26-2.32, <italic>p</italic> &#x3d; 0.001, FDR-<italic>p</italic> &#x3d; 0.006; additive: OR &#x3d; 1.53, 95% CI: 1.22-1.93, <italic>p</italic> &#x3c; 0.0001, FDR-<italic>p</italic> &#x3d; 0.011) and rs1420101 (T vs. C: OR &#x3d; 1.40, 95% CI: 1.12-1.75, <italic>p</italic> &#x3d; 0.003, FDR-<italic>p</italic> &#x3d; 0.018; TT vs. CC: OR &#x3d; 1.98, 95% CI: 1.20-3.25, <italic>p</italic> &#x3d; 0.007, FDR-<italic>p</italic> &#x3d; 0.032; TC-TT vs. CC: OR &#x3d; 1.49, 95% CI: 1.10-2.01, <italic>p</italic> &#x3d; 0.010, FDR-<italic>p</italic> &#x3d; 0.040; additive: OR &#x3d; 1.40, 95% CI: 1.12-1.75, <italic>p</italic> &#x3d; 0.003, FDR-<italic>p</italic> &#x3d; 0.017) were associated with an increased risk of lung cancer in males. The dominant model and the additive model were the optimal models for rs12479210 (AIC &#x3d; 960.1 and BIC &#x3d; 973.7) and rs1420101 (AIC &#x3d; 964.8 and BIC &#x3d; 978.5) with the minimum AIC and BIC values, respectively. However, no significant association was found between <italic>IL1RL1</italic> polymorphisms (rs12479210 and rs1420101) and the risk of lung cancer in females.</p>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption>
<p>Association between rs12479210 and rs1420101 and lung cancer risk stratified by gender. SNP, single nucleotide polymorphism; OR, odds ratio; CI, confidence interval; FDR, false discovery rate; AIC, Akaike Information Criterion; BIC, Bayesian Information Criterion; <italic>p</italic> &#x3c; 0.05 indicates statistical significance.</p>
</caption>
<graphic xlink:href="fgene-14-1183528-g001.tif"/>
</fig>
<p>Age stratified analysis (<xref ref-type="fig" rid="F2">Figure 2</xref> and <xref ref-type="sec" rid="s12">Supplementary Table S2</xref>) revealed that rs12479210 (T vs. C: OR &#x3d; 1.60, 95% CI: 1.21-2.12, <italic>p</italic> &#x3d; 0.001, FDR-<italic>p</italic> &#x3d; 0.020; TT vs. CC: OR &#x3d; 2.59, 95% CI: 1.33-5.08, <italic>p</italic> &#x3d; 0.005, FDR-<italic>p</italic> &#x3d; 0.048; CT-TT vs. CC: OR &#x3d; 1.86, 95% CI: 1.26-2.73, <italic>p</italic> &#x3d; 0.002, FDR-<italic>p</italic> &#x3d; 0.019; additive: OR &#x3d; 1.65, 95% CI: 1.23-2.22, <italic>p</italic> &#x3d; 0.001, FDR-<italic>p</italic> &#x3d; 0.031) was associated with an increased risk of lung cancer in participants aged &#x3e;60. The additive model was the optimal model for rs12479210 with the minimum AIC (602.7) and BIC (619.1) values in participants aged &#x3e;60. However, no significant association was found between IL1RL1 polymorphisms (rs12479210 and rs1420101) and the risk of lung cancer in participants aged &#x2264;60.</p>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption>
<p>Association between rs12479210 and rs1420101 and lung cancer risk stratified by mean age. SNP, single nucleotide polymorphism; OR, odds ratio; CI, confidence interval; FDR, false discovery rate; AIC, Akaike Information Criterion; BIC, Bayesian Information Criterion; <italic>p</italic> &#x3c; 0.05 indicates statistical significance.</p>
</caption>
<graphic xlink:href="fgene-14-1183528-g002.tif"/>
</fig>
<p>Smoking status stratified analysis (<xref ref-type="fig" rid="F3">Figure 3</xref> and <xref ref-type="sec" rid="s12">Supplementary Table S2</xref>) indicated that rs12479210 (CT vs. CC: OR &#x3d; 2.25, 95% CI: 1.48-3.42, <italic>p</italic> &#x3c; 0.0001, FDR-<italic>p</italic> &#x3d; 0.005; CT-TT vs. CC: OR &#x3d; 2.02, 95% CI: 1.36-2.99, <italic>p</italic> &#x3c; 0.0001, FDR-<italic>p</italic> &#x3d; 0.009) was associated with an increased risk of lung cancer in somking subjects. However, no significant association was found between <italic>IL1RL1</italic> polymorphisms (rs12479210 and rs1420101) and risk of lung cancer in non-smoking. No significant association was found between the four SNPs (rs3771180, rs3771175, rs10208293, and rs10197862) in <italic>IL1RL1</italic> and risk of lung cancer in stratified analysis (<xref ref-type="sec" rid="s12">Supplementary Table S2</xref>).</p>
<fig id="F3" position="float">
<label>FIGURE 3</label>
<caption>
<p>Association between rs12479210 and rs1420101 and lung cancer risk stratified by smoking status. SNP, single nucleotide polymorphism; OR, odds ratio; CI, confidence interval; FDR, false discovery rate; AIC, Akaike Information Criterion; BIC, Bayesian Information Criterion; <italic>p</italic> &#x3c; 0.05 indicates statistical significance.</p>
</caption>
<graphic xlink:href="fgene-14-1183528-g003.tif"/>
</fig>
</sec>
<sec id="s3-5">
<title>MDR analysis</title>
<p>Moreover, we conducted the MDR analysis to assess the impact of SNP-SNP interactions on risk of lung cancer. The dendrogram of SNP-SNP interactions is displayed in <xref ref-type="fig" rid="F4">Figure 4</xref>, and the results showed a strong negative correlation between rs12479210 and rs1420101 in terms of their impact on lung cancer risk. Moreover, the one loci model (rs12479210) was the best single model with the highest testing accuracy (0.566) and CVC (10/10) to predict lung cancer risk (<xref ref-type="table" rid="T6">Table 6</xref>).</p>
<fig id="F4" position="float">
<label>FIGURE 4</label>
<caption>
<p>The dendrogram of SNP-SNP interactions.</p>
</caption>
<graphic xlink:href="fgene-14-1183528-g004.tif"/>
</fig>
<table-wrap id="T6" position="float">
<label>TABLE 6</label>
<caption>
<p>The impact of SNP-SNP interactions on risk of LC.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="left">Model</th>
<th align="left">Training bal. Acc</th>
<th align="left">Testing bal. Acc</th>
<th align="left">CVC</th>
<th align="center">OR (95% CI)</th>
<th align="center">
<italic>p</italic>
</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">rs12479210</td>
<td align="center">0.566</td>
<td align="center">0.566</td>
<td align="left">10/10</td>
<td align="left">1.73 (1.34&#x2013;2.22)</td>
<td align="left">&#x3c;0.0001</td>
</tr>
<tr>
<td align="left">rs12479210,rs10197862</td>
<td align="center">0.569</td>
<td align="center">0.565</td>
<td align="left">7/10</td>
<td align="left">1.77 (1.38&#x2013;2.28)</td>
<td align="left">&#x3c;0.0001</td>
</tr>
<tr>
<td align="left">rs12479210,rs10208293,rs10197862</td>
<td align="center">0.573</td>
<td align="center">0.553</td>
<td align="left">5/10</td>
<td align="left">1.85 (1.43&#x2013;2.40)</td>
<td align="left">&#x3c;0.0001</td>
</tr>
<tr>
<td align="left">rs12479210,rs3771180,rs10208293,rs10197862</td>
<td align="center">0.575</td>
<td align="center">0.550</td>
<td align="left">6/10</td>
<td align="left">1.88 (1.46&#x2013;2.44)</td>
<td align="left">&#x3c;0.0001</td>
</tr>
<tr>
<td align="left">rs12479210,rs3771180,rs3771175,rs10208293,rs10197862</td>
<td align="center">0.577</td>
<td align="center">0.547</td>
<td align="left">9/10</td>
<td align="left">1.91 (1.48&#x2013;2.47)</td>
<td align="left">&#x3c;0.0001</td>
</tr>
<tr>
<td align="left">rs12479210,rs3771180,rs1420101,rs3771175,rs10208293,rs10197862</td>
<td align="center">0.577</td>
<td align="center">0.544</td>
<td align="left">10/10</td>
<td align="left">1.91 (1.48&#x2013;2.47)</td>
<td align="left">&#x3c;0.0001</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>LC, lung cancer; Bal. Acc., balanced accuracy; CVC, cross-validation consistency; OR, odds ratio; CI, confidence interval.</p>
</fn>
<fn>
<p>
<italic>p</italic> &#x3c; 0.05 indicates statistical significance.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s3-6">
<title>Bioinformatics analysis</title>
<p>We found statistically significant differences between six SNPs in <italic>IL1RL1</italic> and the expression level of <italic>IL1RL1</italic> in lung cancer tissues using GTEx Portal database (<italic>p</italic> &#x3c; 0.001, <xref ref-type="fig" rid="F5">Figure 5A</xref>). In addition, we found that the expression level of <italic>IL1RL1</italic> was significantly different between normal and LUAD and LUSC tissues (<italic>p</italic> &#x3c; 0.001, <xref ref-type="fig" rid="F5">Figure 5B</xref>). We predicted the signaling pathways involved in the <italic>IL1RL1</italic> gene through the PathCards database (<xref ref-type="fig" rid="F5">Figure 5C</xref>), and found that <italic>IL1RL1</italic> was mainly involved in 11 signaling pathways, such as <italic>IL-1</italic> family signaling pathways, Th2 differentiation, cytokine signaling in immune system, and innate lymphoid cells differentiation.</p>
<fig id="F5" position="float">
<label>FIGURE 5</label>
<caption>
<p>Bioinformatics analysis of <italic>IL1RL1</italic> and polymorphisms <bold>(A)</bold> The differences between six SNPs in <italic>IL1RL1</italic> and the expression level of IL1RL1 in lung cancer tissues. <bold>(B)</bold> The expression level of <italic>IL1RL1</italic> in normal and LUAD and LUSC tissues. <bold>(C)</bold> The signaling pathways involved in the <italic>IL1RL1</italic> gene. LUAD, lung adenocarcinoma; LUSC, lung squamous cell carcinoma; &#x2a;<italic>p</italic> &#x3c; 0.001, <italic>p</italic> &#x3c; 0.05 indicates statistical significance.</p>
</caption>
<graphic xlink:href="fgene-14-1183528-g005.tif"/>
</fig>
</sec>
</sec>
<sec sec-type="discussion" id="s4">
<title>Discussion</title>
<p>This study is the first to explore <italic>IL1RL1</italic> polymorphisms (rs12479210, rs3771180, rs1420101, rs3771175, rs10208293, and rs10197862) and lung cancer susceptibility in the Chinese Han population. The results showed that rs12479210 and rs1420101 in <italic>IL1RL1</italic> were associated with an increased risk of lung cancer in the Chinese Han population. Moreover, bioinformatics analysis results revealed that the expression level of <italic>IL1RL1</italic> was significantly different between normal and LUAD and LUSC tissues, and there were significant differences between six SNPs in <italic>IL1RL1</italic> and the expression level of <italic>IL1RL1</italic> in lung cancer tissues. These results suggest that <italic>IL1RL1</italic> may be involved in the pathogenesis of lung cancer.</p>
<p>The <italic>IL1RL1</italic> gene is located on chromosome 2q12.1 and contains 13 exons, also known as <italic>IL33R</italic>, <italic>ST2</italic>, and <italic>ST2L</italic>. An animal study has illustrated that <italic>IL1RL1</italic> deficiency could reduce lung myeloid cell infiltration and repeatedly activate macrophage function (<xref ref-type="bibr" rid="B4">Dagher et al., 2020</xref>). Liu et al. have revealed that hypoxia significantly increased <italic>IL1RL1</italic> expression by human pulmonary arterial endothelial cells <italic>in vitro</italic> (<xref ref-type="bibr" rid="B16">Liu et al., 2018</xref>). The expression levels of <italic>IL-33</italic> and <italic>ST2</italic> were found to be significantly downregulated in both adenocarcinoma and squamous cell carcinoma of the lung compared to adjacent normal lung tissues (<xref ref-type="bibr" rid="B33">Yang et al., 2018</xref>). The secretion of <italic>ST2</italic> inhibited tumor growth of lung cancer patients, and low <italic>ST2</italic> was associated with worse overall survival (<xref ref-type="bibr" rid="B26">Tzeng et al., 2018</xref>; <xref ref-type="bibr" rid="B9">Gezelius et al., 2022</xref>). <italic>sST2</italic>, a soluble form of <italic>ST2</italic>, has been shown to involve in the inflammatory tumor microenvironment and the progression of non-small cell lung cancer (<xref ref-type="bibr" rid="B10">Hong et al., 2019</xref>; <xref ref-type="bibr" rid="B2">Chang et al., 2020</xref>). A prvious study found that the <italic>IL-33</italic>/<italic>ST2</italic> axis enhances lung-resident CD14<sup>&#x2b;</sup> monocyte function in patients with non-small cell lung cancer (<xref ref-type="bibr" rid="B28">Wang et al., 2023</xref>). In this study, the expression level of <italic>IL1RL1</italic> was found to be significantly different between normal and LUAD and LUSC tissues based on TCGA database, and <italic>IL1RL1</italic> was mainly involved in IL-1 family signaling pathways, cytokine signaling in immune system, and innate lymphoid cells differentiation. However, this study did not explore the specific mechanism of <italic>IL1RL1</italic> in the occurrence and development of lung cancer.</p>
<p>Furthermore, <italic>IL1RL1</italic> genetic variants have been reported to be associated with susceptibility to respiratorydiseases. A genome-wide association study indicated that rs13431828 and rs1041973 in <italic>IL1RL1</italic> were associated with childhood asthma susceptibility in the Mexican population (<xref ref-type="bibr" rid="B30">Wu et al., 2010</xref>). Faber et al. found a genetic association between rs1921622 in <italic>IL1RL1</italic> and disease severity in respiratory syncytial virus bronchiolitis (<xref ref-type="bibr" rid="B6">Faber et al., 2012</xref>). <italic>IL1RL1</italic> polymorphisms rs72823628, rs950881 and rs3771175 were found to be associated with a reduced risk of allergic rhinitis risk in the Chinese Han population (<xref ref-type="bibr" rid="B15">Li et al., 2022</xref>). However, there are few studies on the correlation between <italic>IL1RL1</italic> polymorphisms and lung cancer susceptibility. In this study, we explore the association betweewn <italic>IL1RL1</italic> polymorphisms and lung cancer susceptibility in the Chinese Han population. This study reports for the first time a significant correlation between <italic>IL1RL1</italic> polymorphisms (rs12479210 and rs1420101) and risk of lung cancer in the Chinese Han population. A previous study indicated that <italic>IL1RL1</italic> rs1420101 was associated with high exhaled nitric oxide and blood eosinophil differentials among Japanese patients with asthma (<xref ref-type="bibr" rid="B12">Inoue et al., 2017</xref>). In addition, rs1420101 was strongly associated with <italic>IL1RL1</italic> methylation and serum <italic>IL1RL1-a</italic> levels in asthma (<xref ref-type="bibr" rid="B5">Dijk et al., 2018</xref>). Bioinformatics analysis results revealed that there were significant differences between rs12479210 and rs1420101 and the expression level of <italic>IL1RL1</italic> in lung cancer tissue. Therefore, we speculateed that these two SNPs (rs12479210 and rs1420101) may affect the risk of lung cancer by regulating the expression of <italic>IL1RL1</italic>.</p>
<p>In addition, smoking is indisputably linked to lung cancer, yet only a small fraction of smokers develops this disease (<xref ref-type="bibr" rid="B20">Schuller, 2019</xref>). A recent report showed that women have a higher risk of developing lung cancer upon smoking than men, and the odds ratio to develop lung cancer was almost three times greater for women than for men (<xref ref-type="bibr" rid="B22">Stapelfeld et al., 2020</xref>). The aging of the population is also one of the main reasons for the rise of the incidence rate of lung cancer (<xref ref-type="bibr" rid="B13">Jakobsen et al., 2021</xref>). The results of stratification analysis have shown that rs12479210 was related to the susceptibility of lung cancer in different subgroups, while rs1420101 was not significantly associated with lung cancer risk in males, age &#x3e;60&#xa0;years old, and smokers. Therefore, we speculated that the impacts of age, gender, and smoking on the susceptibility to lung cancer were stronger than rs1420101. These genetic variants of <italic>IL1RL1</italic> may provide new biomarkers for early diagnosis of lung cancer, and it helps us to have a deeper understanding of the pathogenesis of lung cancer.</p>
<p>Of course, this study has some limitations. First, the significance of <italic>IL1RL1</italic> polymorphisms and lung cancer susceptibility was only performed in the Chinese Han population. There are differences in genetic polymorphisms among different ethnic groups, a larger sample size case-control study can be conducted to further confirm the results of this study in different populations. Second, the occurrence of lung cancer is closely related to environmental factors, but this study lacks some information on BMI and alcohol consumption. Third, lung cancer is a heterogeneous disease, and different subtypes of lung cancer may be associated with different genetic variations. Therefore, in future research, we will collect more comprehensive data, including BMI and alcohol consumption, lung cancer subtypes, etc., to better evaluate the association between <italic>IL1RL1</italic> polymorphisms and lung cancer risk. Finally, the specific molecular mechanism of <italic>IL1RL1</italic> genetic variants in the occurrence and development of lung cancer risk is unclear. Therefore, <italic>in vitro</italic> experiments or animal models can be used to investigate the impact of these genetic variants on <italic>IL1RL1</italic> expression and cell proliferation, apoptosis, and other biological processes. Moreover, the distribution of these genetic variants in lung cancer patients can be analyzed and correlated with clinical data such as tumor type, staging, treatment response, etc., to assess their potential clinical utility.</p>
</sec>
<sec sec-type="conclusion" id="s5">
<title>Conclusion</title>
<p>In conclusion, this study suggests that <italic>IL1RL1</italic> genetic variants (rs12479210 and rs1420101) contribute to the susceptibility to lung cancer in the Chinese Han population. These risk variants may be used as biomarkers for the prevention and treatment of lung cancer. However, further research is needed to confirm these findings and to better understand the molecular mechanisms underlying the association between <italic>IL1RL1</italic> polymorphisms and lung cancer risk.</p>
</sec>
</body>
<back>
<sec sec-type="data-availability" id="s6">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/<xref ref-type="sec" rid="s12">Supplementary Material</xref>, further inquiries can be directed to the corresponding author.</p>
</sec>
<sec id="s7">
<title>Ethics statement</title>
<p>The studies involving humans were approved by the Ethics committee of Xuanwei City. The studies were conducted in accordance with the local legislation and institutional requirements. Written informed consent for participation in this study was provided by the participants&#x2019; legal guardians/next of kin.</p>
</sec>
<sec id="s8">
<title>Author contributions</title>
<p>QL drafted the manuscript; CZ performed the DNA extraction and genotyping; YC performed the data analysis; XY and WC performed the sample collection and information recording; KH revised the manuscript; MC conceived and supervised the study. All authors contributed to the article and approved the submitted version.</p>
</sec>
<sec id="s9">
<title>Funding</title>
<p>This work was supported by the Applied Basic Research Foundation of Yunnan Province (CN) (grant number: 2017FE468 (&#x2212;125) and 202001AY070001-111 and KUST-KH2022028Y), the Open Project of the Clinical Medicine Center of the First People&#x2019;s Hospital of Yunnan Province (grant number: 2021LCZXXF-XY12 and 2022LCZXKF-XY04), CAMS Innovation Fund for Medical Sciences (CIFMS) (grant number: 2016-I2M), and Yunnan Province Clinical Center for Hematologic Disease and Yunnan Province Clinical Research Center for Hematologic Disease.</p>
</sec>
<ack>
<p>We would like to express our sincere gratitude to all participants who provided blood samples for this study, as well as the professionals responsible for blood collection.</p>
</ack>
<sec sec-type="COI-statement" id="s10">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="disclaimer" id="s11">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<sec id="s12">
<title>Supplementary material</title>
<p>The Supplementary Material for this article can be found online at: <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fgene.2023.1183528/full#supplementary-material">https://www.frontiersin.org/articles/10.3389/fgene.2023.1183528/full&#x23;supplementary-material</ext-link>
</p>
<supplementary-material xlink:href="Table2.XLSX" id="SM1" mimetype="application/XLSX" xmlns:xlink="http://www.w3.org/1999/xlink"/>
<supplementary-material xlink:href="Table1.DOCX" id="SM2" mimetype="application/DOCX" xmlns:xlink="http://www.w3.org/1999/xlink"/>
</sec>
<sec id="s13">
<title>Abbreviations</title>
<p>AIC, Akaike Information Criterion;; BIC, Bayesian Information Criterion; BMI, body mass index; CHB, Chinese Han Beijing; CI, confidence interval; FDR, false discovery rate; FPRP, false positive report probability; GTEx, Genotype-Tissue Expression; HWE, Hardy-Weinberg equilibrium; IL1RL1, interleukin 1 receptor like 1; LUAD, lung adenocarcinoma; LUSC, lung squamous cell carcinoma; MAF, minor allele frequency; MDR, multifactor dimensionality reduction; OR, odds ratio; SNPs, single nucleotide polymorphisms.</p>
</sec>
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