Impact Factor 6.244 | CiteScore 3.9
More on impact ›

ORIGINAL RESEARCH article

Front. Oncol., 31 July 2020 | https://doi.org/10.3389/fonc.2020.01162

HER2 Exon 20 Insertion Mutations in Lung Adenocarcinoma: Case Series and Response to Pyrotinib

Xinyong Zhang1, Jialin Lv1, Yuhua Wu1, Na Qin1, Li Ma1, Xi Li1, Jingying Nong1, Hui Zhang1, Quan Zhang1, Xinjie Yang1, Huibo Shi2*, Jinghui Wang1* and Shucai Zhang1*
  • 1Department of Medical Oncology, Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing Chest Hospital, Capital Medical University, Beijing, China
  • 2Organ Transplantation Research Institute, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China

HER2 mutations have emerged as oncogenic driver gene mutations in non-small cell lung cancer (NSCLC), which have not been described in detail like other driver gene mutations. Here, 295 patients with advanced lung adenocarcinoma were retrospectively screened for HER2 mutations using next-generation sequencing (NGS), and the positive cases were validated by Sanger sequencing. We identified five cases with HER2 exon 20 insertions, representing 1.7% of 295 lung adenocarcinomas. Among them, four different subtypes of HER2 exon 20 insertions were identified, including a rare subtype G778_S779insCPG never reported before with a partial response (PR) to pyrotinib and progression-free survival (PFS) of 12.8 months. Our findings reveal that HER2 exon 20 insertion mutations were detected in a small subset of lung adenocarcinomas. Given the different drug sensitivities, determining the mutation subtype by next-generation sequencing at the time of diagnosis might make sense.

Introduction

Lung cancer is still the leading cause of cancer-related death around the world (1). Research progress in molecular biology in lung cancer has revealed insights into various crucial signal pathways that control cell survival and proliferation and identified many driver gene mutations that are responsible for cancer development and progression. Therapies targeted on some of these driver gene mutations, such as epidermal growth factor receptor (EGFR)-activating mutations (2), anaplastic lymphoma kinase (ALK) rearrangement (3), and ROS1 rearrangement (4), are associated with a higher response rate (RR) and longer progression-free survival (PFS) than chemotherapy in the clinical practice.

Human epidermal growth factor receptor 2 (HER2/ERBB2) is a member of the ERBB receptor tyrosine kinase family. The ERBB2 gene, which encodes for HER2, is a major proliferative driver that stimulates downstream signaling through PI3K-AKT and MEK-ERK pathways (5). HER2 mutations consist of in-frame insertions in exon 20, leading to constitutive activation of the receptor and downstream AKT and MEK pathways (6).

HER2 mutations have emerged as therapeutic targets in non-small cell lung cancers (NSCLC), occurring in 1.7–3.33% (7, 8). The most common mutations are in-frame insertions in exon 20, especially the A775_G776insYVMA insertion/duplication (79). HER2 mutations have been previously shown to be mutually exclusive with EGFR and ALK rearrangements (7, 9).

Among reported lung cancer biomarkers, HER2 as a target remains poorly described, partly because of its lower incidence without potent targeted therapies. Although results from early phase II trials of trastuzumab as a treatment for HER2-mutant NSCLC have not shown any advantage for most patients, subsequent clinical trials have reported objective responses to afatinib (10, 11), poziotinib (12, 13), dacomitinib (14), neratinib plus temsirolimus (15), trastuzumab (16), trastuzumab emtansine (T-DM1) (17), and pyrotinib (18) in patients with HER2-mutant lung cancers (8). In general, patients with HER2 mutations are resistant to EGFR tyrosine kinase inhibitors (TKIs), but part of them are sensitive to both HER2 inhibitors and dual EGFR/HER2 inhibitors.

Here, we present five NSCLC cases with HER2 exon 20 insertion mutations to show the different subtypes and the heterogeneity in clinical response. Notably, we identified a patient with a rare subtype of HER2 exon 20 mutation G778_S779insCPG who experienced a partial response (PR) to pyrotinib after failure of first-line chemotherapy and second-line immunotherapy.

Materials and Methods

We retrospectively collected 295 patients with pathologically confirmed lung adenocarcinoma (stage IIIB/IV) from January 2017 to March 2019 in Beijing Chest Hospital, Capital Medical University, whose tumor tissue samples were screened for HER2 mutations using next-generation sequencing (NGS). Sanger sequencing was performed in positive cases. The clinical data were collected, including age, gender, smoking status, tumor histology, performance status (PS), and the outcomes of anti-cancer therapies if possible. Tumor response to targeted therapy was evaluated 1 month after the therapy and every 2 months according to Response Evaluation Criteria in Solid Tumors (RECIST version 1.1). Adverse events were evaluated according to the National Cancer Institute (USA) Common Terminology Criteria for Adverse Events, version 4.01 (NCI CTCAE v4.01). The study was approved by an institutional review board in Beijing Chest Hospital, Capital Medical University. All patients provided written informed consent.

Results

Patient Characteristics

A total of 295 patients were pathologically confirmed with adenocarcinoma in stage III/IV. We identified five patients harboring HER2 exon 20 insertion mutations from 295 lung adenocarcinoma patients with a prevalence of 1.7%. The characteristics of patients with HER2 mutations were shown in Table 1. The median age was 64 years old, ranging from 58 to 66 years old. There were three females who never smoked and two males who were current smokers. All of them were stage IV.

TABLE 1
www.frontiersin.org

Table 1. Characteristics of patients with HER2 mutations (N = 5).

Subtypes of HER2 Mutation

Among them, four different subtypes of HER2 exon 20 insertions were identified (Table 1). The most common mutation was A775_G776insYVMA, which was found in two of five cases. The other three were detected only once, including p.778insGCP, p.G780_P781dupGSP, and p.G778_S779insCPG. Moreover, two cases carried concurrent mutations. One had ERBB2 amplification together with p.A775_G776insYVMA. The other one had EML4-ALK fusion (EML4 exon13-ALK exon 20) and p.778insGCP concurrently.

Treatment Outcomes

Patient 4 was a 65 year-old female never-smoker who was diagnosed with advanced lung adenocarcinoma metastatic to lung, bone, mediastinal, and supraclavicular lymph nodes by checks and biopsy of the supraclavicular lymph node in April 2018. The patient received pemetrexed plus carboplatin chemotherapy as the first-line treatment. Two cycles later, she progressed with enlargement of the primary tumor, new onset of nodules in the left lung and malignant pleural effusion. Then she received nivolumab immunotherapy as the second-line treatment and confirmed progressive disease (PD) after eight cycles with new onset of bone and brain metastases. The result of NGS of re-biopsy tissue revealed HER2 exon 20 insertion mutation (p.G778_S779insCPG) (Figures 1A,C). Then, the patient received pyrotinib plus bevacizumab as the third-line therapy, together with intensity modulation radiation therapy (IMRT) for bone metastasis and EDGE radiosurgery for brain metastases. One month later, she achieved partial response (PR): The disease in lungs, mediastinal, and supraclavicular lymph nodes shrank, and pleural effusion reduced (Figure 2). The diseases in the brain also reduced, which may be a response to radiotherapy rather than targeted therapy. During the pyrotinib treatment, grade 2 diarrhea occurred, which led to temporary pyrotinib discontinuance. Four months later, the patient still kept in good performance and PFS was 12.8 months until November 30, 2019. Pyrotinib treatment continued.

FIGURE 1
www.frontiersin.org

Figure 1. The reads of 20 insertion subtypes identified by NGS and Sanger sequencing. (A,C) Patient 4 with G780_P781dupGSP; (B,D) Patient 5 with G778_S779insCPG.

FIGURE 2
www.frontiersin.org

Figure 2. Representative images from chest CT.

Patient 5 was a 60 year-old female initially presenting with advanced lung adenocarcinoma by percutaneous lung puncture and PETCT with metastases to both lungs and mediastinal lymph nodes. She received two cycles of gemcitabine plus cisplatin and eight cycles of nivolumab with a confirmed PD. The result of NGS revealed HER2 insertion mutation (p.G780_P781dupGSP) (Figures 1B,D). Then the patient took pyrotinib as the third-line therapy with the best response of PR, and PFS was 12.5 months until November 30, 2019 (Figure 2). Grade 1 diarrhea and grade 2 nausea occurred during the treatment. The dosage was reduced for a short time and then restored the initial dose after diarrhea and nausea disappeared. Pyrotinib treatment continued. The treatment processes were summarized in Table 2.

TABLE 2
www.frontiersin.org

Table 2. Treatment and response in patents with HER2 exon 20 insertion mutation.

Unfortunately, the other three patients did not follow the medical advice. Patients 1 and 3 still chose chemotherapy in the follow-up treatment after the NGS test, and the treatment effect was not satisfactory. Patient 2 gave up treatment because of the huge cost. Their choices should be respected, and this will not be described too much in subsequent analysis.

Discussion

HER2 mutations represent a small subset of NSCLC. HER2 mutations were significantly associated with female, never-smoker status; advanced stage; and adenocarcinoma (19). In this study, the incidence of HER2 exon 20 insertion mutations was 1.7%. All of the patients were stage IV adenocarcinomas, which was similar to prior series of HER2-mutant NSCLCs.

The most frequent HER2 mutations described to date are insertions within a small stretch of exon 20 with A775_G776insYVMA insertion/duplication on the COOH-terminal side of the C-helix. Eng et al. (20) reports an in-frame insertion in exon 20 identified in 34 patients: 24 with identical 12 base pair insertion YVMA, 4 with 9 base pair insertions, 1 with a 6 base pair insertion, and 5 with 3 base pair insertions. A single base pair substitution was identified in four patients and included L755F, V777L, D769H in exon 20, and S310F in exon 8. Wang et al. (21) reports that 24 patients had the variants of HER2 mutation including 14 with exon20 A775_G776insYVMA, 3 with P780_Y781insGSP, 3 with G776 > VC, 2 with G776 > IC, 1 with G776 > LC, and 1 with G776C.

In this study, the HER2 exon 20 insertion mutations were scattered (shown in Table 1). Two patients had HER2 exon 20 insertions with the most common YVMA mutation. Notably, one patient had a rare HER2 exon 20 insertion mutation of G778_S779insCPG. Moreover, we found that HER2 mutations and other driver gene mutations may not be completely mutually exclusive, which was consistent with some recent research (22). The reason might be the widespread use of NGS. In addition, HER2 amplifications were common concomitant variants with HER2 mutations, and the detection rates from different studies varied widely, ranging from 8 to 57% (8, 23, 24).

According to guidelines for NSCLC, chemotherapy is still the standard therapy for patients with HER2-mutant advanced NSCLC and particularly pemetrexed-containing regimens, which are most active against lung adenocarcinomas (25). Check point inhibitors, nivolumab and pembrolizumab, are recommended as a second line for advanced or metastatic NSCLC. Mazieres et al. (22) report the RR and the median PFS for patients receiving first-line chemotherapy were 43.5% and 6 months (95% CI: 5; 7.1), respectively (n = 93). Most patients had first-line chemotherapy with a platinum-based doublet (without HER2-tageting treatment) (n = 71). In those receiving second-line chemotherapies, RR and PFS were 10% and 4.3 months, respectively (n = 52). Unfortunately, the patients in our study did not get any benefit from platinum-based doublet chemotherapies. Li et al. (26) reported that none of the seven patients with HER2 mutant NSCLC achieved a response to prior PD-1 inhibitors, which was similar to our patients.

Targeted therapies are highlighted in this small cohort of patients with HER2 mutations. For trastuzumab in combination with chemotherapy, RR, disease control rate (DCR), and PFS were 50, 75%, and 5.1 months, respectively (22). Lai et al. (27) report three out of 23 patients with HER2-mutant NSCLC (13%) had PR after afatinib treatment. Median duration of response of afatinib was 6 months, and median overall survival (OS) was 23 months. In a phase II study, pyrotinib, an irreversible pan-HER receptor TKI with activity against EGFR/HER1 and HER2, showed activity against HER2 mutant NSCLC and resulted in an ORR of 53.3% and a median PFS of 6.4 months (28). Except for G776>IC, patients with A775_G776insYVMA, P780_Y781insGSP, G776C, G776>VC, and L755P all responded to pyrotinib. We found not only P780_Y781insGSP, but also the rare mutation G778_S779insCPG were sensitive points for the treatment. The patients might derive more clinical benefit if they were treated at an earlier point of the disease course with a better performance status. It should be recommended to support further clinical testing of pyrotinib in NSCLC patients with HER2 exon 20 mutations to determine its impact on the OS, RR, DOR as well as the safety and toxicity.

The limitation of the paper is its retrospective design and the small sample. It is very difficult to study these less common but complex molecular subgroups of cancers. More efficient, well-designed trials, such as basket trials, might be conducted for these cancers.

In this study, HER2 exon 20 insertion mutations were found in 5 (1.7%) of the lung adenocarcinomas with a rare subtype G778_S779insCPG identified and sensitive to pyrotinib. Due to different mutation subtypes responding differently to HER2-targeted agents, the subtype should be adequately defined.

Data Availability Statement

All data generated or analyzed during the current study are available from the corresponding author on reasonable request.

Ethics Statement

The studies involving human participants were reviewed and approved by Institutional review committee of Beijing Chest Hospital, Capital Medical University. The patients/participants provided their written informed consent to participate in this study. Written informed consent was obtained from the patients for the publication of this case series and any potentially identifying information and images.

Author Contributions

XZ, JL, and YW contributed to the conception, analysis, and wrote the article. NQ, LM, XL, JN, HZ, QZ, and XY provided conceptual advice, software and analysis, performed the data curation, resources, and review. HS, JW, and SZ contributed to the conception, analysis, resources, revised the original draft, and gave final approval of the version. All authors contributed to the article and approved the submitted version.

Funding

This study was supported by Capital Health Development Scientific Research Fund - The Young Talents Program (2018-4-1043).

Conflict of Interest

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.

Acknowledgments

We would like to thank all patients in our study. We are indebted to Dr. He Howard Zhang for his careful English assistance during the preparation of the manuscript. We thank Shanghai Tongshu Biotechnology Co., Ltd. for technical support.

Supplementary Material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fonc.2020.01162/full#supplementary-material

Abbreviations

NSCLC, non-small cell lung cancer; HER2, Human epidermal growth factor receptor 2; NGS, next-generation sequencing; EGFR, epidermal growth factor receptor; ALK, anaplastic lymphoma kinase; RR, response rate; PFS, progression free survival; PR, partial response; PS, performance status; PD, progressive disease; OS, overall survival.

References

1. Bray F, Ferlay J, Soerjomataram I, Siegel RL, Torre LA, Jemal A. Global cancer statistics 2018: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA Cancer J Clin. (2018) 68:394–424. doi: 10.3322/caac.21492

PubMed Abstract | CrossRef Full Text | Google Scholar

2. Mok TS, Wu YL, Thongprasert S, Yang CH, Chu DT, Saijo N, et al. Gefitinib or carboplatin-paclitaxel in pulmonary adenocarcinoma. N Engl J Med. (2009) 361:947–57. doi: 10.1056/NEJMoa0810699

CrossRef Full Text | Google Scholar

3. Solomon BJ, Mok T, Kim DW, Wu YL, Nakagawa K, Mekhail T, et al. First-line crizotinib versus chemotherapy in ALK-positive lung cancer. N Engl J Med. (2014) 371:2167–77. doi: 10.1056/NEJMoa1408440

PubMed Abstract | CrossRef Full Text | Google Scholar

4. Shaw AT, Riely GJ, Bang YJ, Kim DW, Camidge DR, Varella-Garcia M, et al. Crizotinib in ROS1-rearranged advanced non-small-cell lung cancer (NSCLC): updated results, including overall survival, from PROFILE 1001. Ann Oncol. (2019) 30:1121–26. doi: 10.1093/annonc/mdz063.005

PubMed Abstract | CrossRef Full Text | Google Scholar

5. Spector NL, Blackwell KL. Understanding the mechanisms behind trastuzumab therapy for human epidermal growth factor receptor 2-positive breast cancer. J Clin Oncol. (2009) 27:5838–47. doi: 10.1200/JCO.2009.22.1507

PubMed Abstract | CrossRef Full Text | Google Scholar

6. Perera SA, Li D, Shimamura T, Raso MG, Ji H, Chen L, et al. HER2YVMA drives rapid development of adenosquamous lung tumors in mice that are sensitive to BIBW2992 and rapamycin combination therapy. Proc Natl Acad Sci USA. (2009) 106:474–9. doi: 10.1073/pnas.0808930106

PubMed Abstract | CrossRef Full Text | Google Scholar

7. Arcila ME, Chaft JE, Nafa K, Roy-Chowdhuri S, Lau C, Zaidinski M, et al. Prevalence, clinicopathologic associations, and molecular spectrum of ERBB2 (HER2) tyrosine kinase mutations in lung adenocarcinomas. Clin Cancer Res. (2012) 18:4910–18. doi: 10.1158/1078-0432.CCR-12-0912

PubMed Abstract | CrossRef Full Text | Google Scholar

8. Mazieres J, Peters S, Lepage B, Cortot AB, Barlesi F, Beau-Faller M, et al. Lung cancer that harbors an HER2 mutation: epidemiologic characteristics and therapeutic perspectives. J Clin Oncol. (2013) 31:1997–2003. doi: 10.1200/JCO.2012.45.6095

PubMed Abstract | CrossRef Full Text | Google Scholar

9. Liu Z, Wu L, Cao J, Yang Z, Zhou C, Cao L, et al. Clinical characterization of ERBB2 exon 20 insertions and heterogeneity of outcomes responding to afatinib in Chinese lung cancer patients. OncoTargets Ther. (2018) 11:7323–31. doi: 10.2147/OTT.S173391

PubMed Abstract | CrossRef Full Text | Google Scholar

10. De Greve J, Teugels E, Geers C, Decoster L, Galdermans D, De Mey J, et al. Clinical activity of afatinib (BIBW 2992) in patients with lung adenocarcinoma with mutations in the kinase domain of HER2/neu. Lung Cancer. (2012) 76:123–7. doi: 10.1016/j.lungcan.2012.01.008

PubMed Abstract | CrossRef Full Text | Google Scholar

11. De Greve J, Moran T, Graas MP, Galdermans D, Vuylsteke P, Canon JL, et al. Phase II study of afatinib, an irreversible ErbB family blocker, in demographically and genotypically defined lung adenocarcinoma. Lung Cancer. (2015) 88:63–9. doi: 10.1016/j.lungcan.2015.01.013

PubMed Abstract | CrossRef Full Text | Google Scholar

12. Robichaux JP, Elamin YY, Tan Z, Carter BW, Zhang S, Liu S, et al. Mechanisms and clinical activity of an EGFR and HER2 exon 20-selective kinase inhibitor in non-small cell lung cancer. Nat Med. (2018) 24:638–46. doi: 10.1038/s41591-018-0007-9

PubMed Abstract | CrossRef Full Text | Google Scholar

13. Kim TM, Lee KW, Oh DY, Lee JS, Im SA, Kim DW, et al. Phase 1 studies of poziotinib, an irreversible Pan-HER tyrosine kinase inhibitor in patients with advanced solid tumors. Cancer Res Treat. (2018) 50:835–42. doi: 10.4143/crt.2017.303

PubMed Abstract | CrossRef Full Text | Google Scholar

14. Kris MG, Camidge DR, Giaccone G, Hida T, Li BT, O'Connell J, et al. Targeting HER2 aberrations as actionable drivers in lung cancers: phase II trial of the pan-HER tyrosine kinase inhibitor dacomitinib in patients with HER2-mutant or amplified tumors. Ann Oncol. (2015) 26:1421–7. doi: 10.1093/annonc/mdv186

CrossRef Full Text | Google Scholar

15. Gandhi L, Bahleda R, Tolaney SM, Kwak EL, Cleary JM, Pandya SS, et al. Phase I study of neratinib in combination with temsirolimus in patients with human epidermal growth factor receptor 2-dependent and other solid tumors. J Clin Oncol. (2014) 32:68–75. doi: 10.1200/JCO.2012.47.2787

PubMed Abstract | CrossRef Full Text | Google Scholar

16. Cappuzzo F, Bemis L, Varella-Garcia M. HER2 mutation and response to trastuzumab therapy in non-small-cell lung cancer. N Engl J Med. (2006) 354:2619–21. doi: 10.1056/NEJMc060020

PubMed Abstract | CrossRef Full Text | Google Scholar

17. Peters S, Stahel R, Bubendorf L, Bonomi P, Villegas A, Kowalski DM, et al. Trastuzumab emtansine (T-DM1) in patients with previously treated HER2-overexpressing metastatic non-small cell lung cancer: efficacy, safety, and biomarkers. Clin Cancer Res. (2019) 25:64–72. doi: 10.1158/1078-0432.CCR-18-1590

PubMed Abstract | CrossRef Full Text | Google Scholar

18. Zhou M, Fan J, Li Z, Li P, Sun Y, Yang Y, et al. Prognostic impact of tumor mutation burden and the mutation in KIAA1211 in small cell lung cancer. Respir Res. (2019) 20:248. doi: 10.1186/s12931-019-1205-9

PubMed Abstract | CrossRef Full Text | Google Scholar

19. Sholl LM, Aisner DL, Varella-Garcia M, Berry LD, Dias-Santagata D, Wistuba II, et al. Multi-institutional oncogenic driver mutation analysis in lung adenocarcinoma: the lung cancer mutation consortium experience. J Thoracic Oncol. (2015) 10:768–77. doi: 10.1097/JTO.0000000000000516

PubMed Abstract | CrossRef Full Text | Google Scholar

20. Eng J, Hsu M, Chaft JE, Kris MG, Arcila ME, Li BT. Outcomes of chemotherapies and HER2 directed therapies in advanced HER2-mutant lung cancers. Lung Cancer. (2016) 99:53–6. doi: 10.1016/j.lungcan.2016.05.030

PubMed Abstract | CrossRef Full Text | Google Scholar

21. Wang Y, Zhang S, Wu F, Zhao J, Li X, Zhao C, et al. Outcomes of pemetrexed-based chemotherapies in HER2-mutant lung cancers. BMC Cancer. (2018) 18:326. doi: 10.1186/s12885-018-4277-x

PubMed Abstract | CrossRef Full Text | Google Scholar

22. Mazieres J, Barlesi F, Filleron T, Besse B, Monnet I, Beau-Faller M, et al. Lung cancer patients with HER2 mutations treated with chemotherapy and HER2-targeted drugs: results from the European EUHER2 cohort. Ann Oncol. (2016) 27:281–6. doi: 10.1093/annonc/mdv573

PubMed Abstract | CrossRef Full Text | Google Scholar

23. Yoshizawa A, Sumiyoshi S, Sonobe M, Kobayashi M, Uehara T, Fujimoto M, et al. HER2 status in lung adenocarcinoma: a comparison of immunohistochemistry, fluorescence in situ hybridization (FISH), dual-ISH, gene mutations. Lung Cancer. (2014) 85:373–8. doi: 10.1016/j.lungcan.2014.06.007

PubMed Abstract | CrossRef Full Text | Google Scholar

24. Suzuki M, Shiraishi K, Yoshida A, Shimada Y, Suzuki K, Asamura H, et al. HER2 gene mutations in non-small cell lung carcinomas: concurrence with Her2 gene amplification and Her2 protein expression and phosphorylation. Lung Cancer. (2015) 87:14–22. doi: 10.1016/j.lungcan.2014.10.014

PubMed Abstract | CrossRef Full Text | Google Scholar

25. Scagliotti GV, Parikh P, von Pawel J, Biesma B, Vansteenkiste J, Manegold C, et al. Phase III study comparing cisplatin plus gemcitabine with cisplatin plus pemetrexed in chemotherapy-naive patients with advanced-stage non-small-cell lung cancer. J Clin Oncol. (2008) 26:3543–51. doi: 10.1200/JCO.2007.15.0375

PubMed Abstract | CrossRef Full Text | Google Scholar

26. Li BT, Shen R, Buonocore D, Olah ZT, Ni A, Ginsberg MS, et al. Ado-trastuzumab emtansine for patients with HER2-mutant lung cancers: results from a phase II basket trial. J Clin Oncol. (2018) 36:2532–37. doi: 10.1200/JCO.2018.77.9777

PubMed Abstract | CrossRef Full Text | Google Scholar

27. Lai WV, Lebas L, Barnes TA, Milia J, Ni A, Gautschi O, et al. Afatinib in patients with metastatic or recurrent HER2-mutant lung cancers: a retrospective international multicentre study. Eur J Cancer. (2019) 109:28–35. doi: 10.1016/j.ejca.2018.11.030

PubMed Abstract | CrossRef Full Text | Google Scholar

28. Liu Y, Wang JX, Nie ZY, Wen Y, Jia XJ, Zhang LN, et al. Upregulation of ERp57 promotes clear cell renal cell carcinoma progression by initiating a STAT3/ILF3 feedback loop. J Exp Clin Cancer Res CR. (2019) 38:439. doi: 10.1186/s13046-019-1453-z

PubMed Abstract | CrossRef Full Text | Google Scholar

Keywords: lung adenocarcinoma, human epidermal growth factor receptor 2, exon 20, driver oncogenes, pyrotinib

Citation: Zhang X, Lv J, Wu Y, Qin N, Ma L, Li X, Nong J, Zhang H, Zhang Q, Yang X, Shi H, Wang J and Zhang S (2020) HER2 Exon 20 Insertion Mutations in Lung Adenocarcinoma: Case Series and Response to Pyrotinib. Front. Oncol. 10:1162. doi: 10.3389/fonc.2020.01162

Received: 14 January 2020; Accepted: 09 June 2020;
Published: 31 July 2020.

Edited by:

Timothy F. Burns, University of Pittsburgh, United States

Reviewed by:

Kamini Singh, Cornell University, United States
Sandeep Mittal, University of Texas MD Anderson Cancer Center, United States

Copyright © 2020 Zhang, Lv, Wu, Qin, Ma, Li, Nong, Zhang, Zhang, Yang, Shi, Wang and Zhang. 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.

*Correspondence: Huibo Shi, jimshihuibo@163.com; Jinghui Wang, jinghuiwang2006@163.com; Shucai Zhang, sczhang6304@163.com

These authors have contributed equally to this work