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ORIGINAL RESEARCH article

Front. Oncol., 05 August 2022
Sec. Breast Cancer
This article is part of the Research Topic Heterogeneity in Breast Cancer: Clinical and Therapeutic Implications View all 20 articles

Correlation of dynamic contrast-enhanced MRI and diffusion-weighted MR imaging with prognostic factors and subtypes of breast cancers

Hui ChenHui Chen1Wei LiWei Li1Chao WanChao Wan1Jue Zhang*Jue Zhang2*
  • 1Department of Oncology, Tianmen First People’s Hospital, Tianmen, China
  • 2Department of CT/MRI, Tianmen First People's Hospital, Tianmen, China

Objective: To determine the preoperative magnetic resonance imaging (MRI) findings of breast cancer on dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and diffusion-weighted magnetic resonance imaging (DWI) in different molecular subtypes.

Materials and methods: A retrospective study was conducted on 116 breast cancer subjects who underwent preoperative MRI and surgery or biopsy. Three radiologists retrospectively assessed the morphological and kinetic characteristics on DCE-MRI and tumor detectability on DWI, by using apparent diffusion coefficient (ADC) values of lesions. The clinicopathologic and MRI features of four subtypes were compared. The correlation between clinical and MRI findings with molecular subtypes was evaluated using the chi-square and ANOVA tests, while the Mann–Whitney test was used to analyze the relationship between ADC and prognostic factors.

Results: One hundred and sixteen women diagnosed with breast cancer confirmed by surgery or biopsy had the following subtypes of breast cancer: luminal A (27, 23.3%), luminal B (56, 48.2%), HER2 positive (14, 12.1%), and triple-negative breast cancer (TNBC) (19, 16.4%), respectively. Among the subtypes, significant differences were found in axillary node metastasis, histological grade, tumor shape, rim enhancement, margin, lesion type, intratumoral T2 signal intensity, Ki-67 index, and paratumoral enhancement (p < 0.001, p < 0.001, p < 0.001, p < 0.001, p < 0.001, p < 0.001, p < 0.001, p < 0.001, and p = 0.02, respectively). On DWI, the mean ADC value of TNBC (0.910 × 10−3 mm2/s) was the lowest compared to luminal A (1.477×10−3 mm2/s), luminal B (0.955 × 10−3 mm2/s), and HER2 positive (0.996 × 10−3 mm2/s) (p < 0.001). Analysis of the correlation between different prognostic factors and ADC value showed that only axillary lymph node status and ADC value had a statistically significant difference (p = 0.009).

Conclusion: The morphologic features of MRI can be used as imaging biomarkers to identify the molecular subtypes of breast cancer. In addition, quantitative assessments of ADC values on DWI may also provide biological clues about molecular subtypes.

Introduction

Breast cancer is a group of heterogeneous diseases with different molecular subtypes, morphological features, clinical behaviors, and treatment responses. For a better patient-based approach, one of the most important indicators to evaluate disease and its prognosis is the molecular subtype, together with tumor size, histological grade, and the presence of metastatic axillary lymph nodes (1, 2). In addition to these, other standard histological factors are useful to determine different prognoses and management of the disease, including histological grade, the Ki-67 proliferation index, and the expression of the estrogen receptor (ER), the progesterone receptor (PR), and the human epidermal growth factor receptor 2 (HER2) (3). By immunohistochemistry and fluorescence in-situ hybridization, the current commonly accepted molecular subtypes include luminal A (ER+/PR+/HER2−, Ki-67 < 15%), luminal B (ER+/PR+ or –/HER2 positive or negative, Ki-67 ≥ 15%), HER2-enriched (EP−/PR−, HER2 positive), and triple-negative breast cancer (TNBC) (ER−/RP−, HER2 negative). Several studies have confirmed that distinct molecular subtypes respond differently to therapy and are related to different prognoses: luminal A is usually the most common molecular subtype and typically confers the best prognosis, luminal B shows a good response to radiation therapy and has intermediate survival, and HER2-enriched and triple-negative breast cancer have a good response to chemotherapy but the worst overall survival (4, 5).

Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is the most accurate and the highest sensitivity diagnostic imaging technique for detecting breast cancer, which might not be identified with mammography or ultrasound (6, 7). In the case of breast cancer, the ability to predict tumor molecular subtypes with imaging may provide an important contribution to clinical practice of early treatment planning and understanding of prognosis. Until now, very little is known about the diffusion-weighted MRI (DWI) characteristics of different subtypes of breast cancer (8). By studying the underlying biological and functional characteristics, DWI is expected to eventually improve our understanding of the subtypes of breast cancer, especially prognosis and treatment plans (913). The aim of our study was to investigate the MRI features of the molecular subtypes of cancer in patients using DCE-MRI and DWI.

Materials and methods

Patient selection

The local institutional review board approved this retrospective study, and the informed consent requirement was waived. A retrospective analysis was performed on 116 women aged 26–74 years who underwent breast magnetic resonance examination and have been submitted to biopsy or surgery with the diagnosis of breast cancer in our hospital from September 2017 to March 2022. The following exclusion criteria were applied: 1) patients treated with neoadjuvant chemotherapy; 2) patients with incomplete information on ER, PR, and HER2 status; and 3) those who dropped treatment or did not receive follow-up treatment in our hospital.

Histopathologic assessment

Serial slices of specimens from breast-conserving surgery or from mastectomy were analyzed by one pathologist who evaluated the size of the tumor, axillary node invasion, and histopathologic grade according to the Elston–Ellis classification and then classified the histotype according to the World Health Organization system. The tissue specimens were fixed with 10% formaldehyde, embedded in paraffin, sliced into 5-μm-thick sections, and stained with hematoxylin and eosin (HE). The receptor status was considered positive if the expression of each receptor was 10% or greater. In HER2 immunohistochemical staining, a score of 0 or 1+ was negative, 3+ was positive, and 2+ was equivocal, and the status of patients was verified using fluorescence in-situ hybridization (FISH), where FISH results were either positive or negative. Breast cancer was classified into four types according to the expression of ER/PR/HER2 in immunohistochemistry.

Imaging protocol

All breast MR examinations were performed using a 3.0-T MRI system (Signa Pioneer, GE Healthcare (Boston, USA)) in a prone position using dedicated bilateral breast surface coils. Each study included a precontrast non-fat-saturated T1-weighted sequence, a precontrast fat-saturated T2-weighted sequence, and DWI (with two b-values, 0 and 1,000 s/mm2). Gadolinium with meglumine Magenwijan (Guangzhou, China) was administered intravenously at 0.2 mmol/kg. The images were collected once before the contrast scan with 3D Vibrant technology (California, USA), and then eight images within 6 min should be collected after contrast injection. All the 3D Vibrant images used the ReadyView dynamic enhancement curve post-processing.

Image interpretation

Magnetic resonance imaging including DWI was independently reviewed by three radiologists (with 15, 9, and 6 years of experience in breast MRI, respectively), using the American College of Radiology BI-RADS (Breast Imaging Reporting and Data System) MR lexicon (14). All of them were blinded to clinical and pathologic information. The conclusions of the three radiologists were compared and discordances were resolved by consensus. The MR imaging findings were evaluated for lymph node involvement, morphological characteristics (margin, shape, T2 intensity), rim enhancement, and contrast enhancement kinetics, while kinetic analysis was evaluated with a time–intensity curve (TIC). TIC is based on a region of interest (ROI) that is plotted on the brightest enhancement region to avoid bleeding and necrosis. In the end, morphological manifestations, enhancement types, and TIC types of lesions were analyzed and recorded.

Statistical analysis

The chi-square test or Fisher’s exact test was used to compare the clinicopathological features among the four tumor subtypes for categorical variables and the ANOVA test for continuous variables. Categorical data were presented as frequency and percentage, whereas continuous data were presented as mean and standard deviation. To evaluate the normality of the quantitative variable distributions, the Mann–Whitney test and the Kruskal–Wallis test were carried out. All analyses were performed using SPSS version 23 (SPSS Inc., SPSS®, Chicago, IL, USA), with p <0.05 considered to indicate a significant difference.

Results

Clinicopathological features

The clinicopathological features of the patients are summarized in Table 1. Of the 116 invasive breast cancers, 27 (23.3%) were classified as luminal A, 56 (48.2%) as luminal B, 14 (12.1%) as HER2-enriched, and 19 (16.4%) as TNBC. The mean age of the patients was 51.90 ± 10.68 years (range 26 to 74). In our study, invasive ductal carcinoma was the main pathologic type (107 cases, 92.3%), and there were 9 cases only (accounting for 7.7%) of invasive lobular carcinoma and other types of breast cancer. The highest histological grade (grade 3) was associated with HER2-enriched and TNBC compared to the luminal subtypes. Tumor histological grade was significantly different among the four subtypes (p < 0.001), as well as the mean Ki-67 index (p < 0.001) and the presence of axillary nodal status (p < 0.001). However, there were no differences in age and tumor sizes.

TABLE 1
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Table 1 Clinicopathological features stratified by molecular subtypes.

MR imaging features

In our study, mass lesions were the most commonly detected in MRI (94%). MR imaging features stratified by molecular subtypes are summarized in Table 2 and two cases are shown in Figures 1, Figure 2. On DCE-MRI, the differences in tumor shape, internal enhancement mode, tumor margin, tumor type, and intratumoral T2 signal intensity among the molecular types were statistically significant between groups (p < 0.001, p < 0.001, p < 0.001, p < 0.001, respectively). Compared to other molecular types, TNBC was more likely to present a regular shape (73.7%), rim enhancement (73.7%), unifocal tumor (78.9%), smooth margin (89.5%), and higher intratumor enhancement of T2 by Bonferroni-adjusted multiple comparisons (89.5%). Moreover, we found that all TNBC patients presented with medium/high T2 signal. Although TNBC in the study was more frequently detected as unifocal lesions than other subtypes (78.9%), the difference was not statistically significant. A detailed analysis of the kinetic curves has shown that all cases have a similar behavior, reaching a plateau before washing out. After dividing the cases into three groups with respect to the tumor diameter (<2, ≥2, <5, ≥5 cm), it was found that there was no significant difference in the distribution of each curve among subgroups as well as tumor size. In addition, the comparative analysis of paratumor signal intensity showed statistically significant differences among subtypes (p = 0.02), which could be better used for molecular typing identification.

TABLE 2
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Table 2 MR imaging features stratified by molecular subtypes.

FIGURE 1
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Figure 1 A 53-year-old woman diagnosed with invasive ductal carcinoma of the luminal B subtype. The T2-weighted image shows a strong hyperintense signal inside the mass without enhancement on subtracted images, representing necrosis. The Vibrant technology shows an irregular mass with an irregular margin and a heterogeneous enhancement. Kinetic curves generated from two regions of the enhanced ring demonstrate a plateau appearance (type II curve).

FIGURE 2
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Figure 2 A 50-year-old woman with a solitary hyperintensity in T2 lesion, with rim enhancement in Vibrant and a type II kinetic curve (plateau).

Correlation between the prognostic factors and apparent diffusion coefficient values

On DWI, the mean apparent diffusion coefficient (ADC) value of TNBC (0.910 × 10−3 mm2/s) was lower compared to the mean ADC values for luminal A, luminal B, and HER2+ (1.477, 0.955, and 0.996; p < 0.001) (Table 2). The correlation between the prognostic factors and ADC values is summarized in Table 3. The average ADC values of the ER-positive (84, 72.4%) and PR-positive (72, 62.1%) groups were greater than those of the ER- and PR-negative ones (0.993 × 10−3 vs. 0.941 × 10−3 mm2/s, 1.002 × 10−3 vs. 0.940 × 10−3 mm2/s). However, the difference between the ADC values of the HER2 and axillary lymph nodes under different states was higher in the negative group (1.001 × 10−3 vs. 0.923 × 10−3 mm2/s, 1.078 × 10−3 vs. 0.892 × 10−3 mm2/s). The difference was statistically significant only in axillary lymph node status (p = 0.009).

TABLE 3
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Table 3 The correlation between the prognostic factors and ADC values.

Discussion

Knowing the molecular subtypes of breast cancer is key to defining a correct, patient-oriented plan. The different molecular subtypes of breast cancer could have different initial symptoms and metastatic spread and respond differently to radiotherapy and chemotherapy (15). These findings suggest that diagnostic tests, treatment strategies, and surveillance may better guide the collection of information from each patient’s specific molecular subtype of breast cancer. Our study provides an additional step in that direction by identifying clinical findings between different molecular subtypes, which may help guide the preoperative use of breast MR imaging.

The cancer subtype has been shown to be a key condition to determine the correct treatment. As of today, though, the existence of axillary lymph node metastasis still determines the treatment sequence (preoperative vs. postoperative), the type of therapy (endocrine, chemotherapy, and/or targeted therapy), and the drugs and cycle used (16, 17). Lymph node status is also helpful to estimate the prognosis and the consequent benefits of systemic therapies. The clinical approaches to the assessment and treatment of axillary breast cancer in the early stage are evolving and are guided by studies supporting less aggressive surgery (18) and more aggressive radiotherapy for lymph node-positive disease (19). However, the relationship between tumor subtypes and axillary lymph node status is currently unclear. Previous studies have had conflicting results on the incidence of lymph node metastasis in TNBC, with no clear evidence of increase in axillary lymph node metastasis in more aggressive tumors (20, 21). Our study found that pathological analysis confirmed the presence of metastatic lymph node metastasis in luminal B and HER2-positive breast cancer, which was consistent with Grimm et al. Because HER2 and luminal B subtypes are easier to diagnose, the clinical use of MRI to help guide treatment plans such as axillary management and systemic therapy may be more effective for HER2 and luminal B subtypes and may influence clinical outcomes (22).

Breast cancer subtypes have some specific imaging features. From the literature, we know that some particular characteristics of TNBC can be found on breast MRI, such as regular shape, smooth edge, rim enhancement, unifocal lesion, higher histological grade, and high intratumoral signal intensity on T2-weighted images (2327). In contrast, the luminal type of breast cancer showed more irregular-shaped masses on MRI (24, 27), which was consistent with our findings. In our study, 73.7% of TNBC showed rim enhancement. Navarro Vilar et al. (27) confirmed that 68.7% of TNBC tumors had rim enhancement. Based on this conclusion, the authors pointed out that rim enhancement of the mass is the most useful finding for predicting TNBC. According to relevant literature, the incidence of rim enhancement in TNBC varies from 41% to 80% (7, 24, 27), and our findings are also within this range. Meanwhile, we found irregular margin features, homogeneous enhancement, and medium/low T2 signal intensity within the tumor associated with luminal subtypes. These findings are similar to other studies in the literature (23, 27). Due to the different intensities of tissue hyperplasia response, high-grade and fast-growing masses have a well-defined margin, while low-grade and slow-growing masses have a poorly defined margin and are spiculated, which may be explained by the desmoplastic reaction in adjacent breast tissues. This is the main reason for the detection of different morphological characteristics in different subtypes. What is striking is that morphological features such as round shape, circumscribed margin, and increased T2 signal intensity are also indicators of benign breast lesions (28). It should be kept in mind when evaluating breast MRI that these features are common in invasive breast cancer subtypes.

DCE-MRI has high sensitivity in assessing breast cancer, but there are differences in specificity. DWI can improve the diagnostic accuracy of DCE-MRI, and it is usually used as a component of multiparameter imaging to evaluate breast cancer (2933). Some studies have reported the relationship between ADC values and prognostic factors in other subtypes of breast cancer, except TNBC (34, 35). Studies have reported that in luminal breast cancer, the average ADC value in the high proliferation group was significantly lower than that in the low proliferation group (36). However, few studies have reported the relationship between ADC value and the prognostic factors of breast cancer. In our study, the mean value of ADC was lower in the positive axillary lymph node, HER2-positive, ER-negative, and PR-negative groups. Although such difference was statistically significant only in the axillary lymph node status group, we assumed that the difference between ADC value and other prognostic factors may also be meaningful within a larger sample. A low ADC value is known as a hallmark of malignancy (28, 37). On this premise, we boldly hypothesized that ADC value might be a prognostic indicator of breast cancer.

As we all know, breast cancer is a heterogeneous disease, so early detection may be more helpful in clinical practice, such as early treatment planning and follow-up strategies. Unfortunately, the molecular typing of breast cancer can only be determined by the histopathological assessment of receptor status. Studies have shown that different molecular subtypes can be predicted by imaging findings, such as the shape of mass lesions, rim features, T2 signal intensity, and contrast enhancement features (2326, 2831). However, to our knowledge, there is no formal diagnostic method based on MRI.

Different from past research, we not only compared tumor lesions on MRI but also observed specific differences in the signal performance of surrounding tissues. The comparative analysis of paratumor signal intensity showed statistically significant differences among subtypes, which could help us better conduct molecular typing. Furthermore, all patients in our study received 3.0 T MRI. Compared to 1.5 T, our image resolution and quality were better, and these greatly enhanced the credibility of our study.

However, our study also had limitations. The biggest limitation was that the sample size was relatively small, with a limited number of some tumor subtypes. Secondly, this was a retrospective study and all the data were from a single institution, which may lead to selection bias. Finally, our study design did not collect patient prognostic data, which will be an important next step in evaluating the relationship between molecular subtypes and preoperative MRI.

Conclusions

In summary, breast cancer subtypes, especially TNBC, exhibit multiple characteristic MRI features on DCE-MRI. With advances in imaging technology, the morphologic features of MRI can be used as imaging biomarkers to identify the molecular subtypes of breast cancer in the future. In addition, quantitative assessments of ADC values on DWI may also provide biological clues about molecular subtypes. Of course, a multicenter study with a larger sample size is needed to investigate this issue.

Data availability statement

The original contributions presented in the study are included in the article/supplementary material. Further inquiries can be directed to the corresponding author.

Author contributions

CW: conceptualization, methodology, and visualization. WL: supervision. JZ: data curation, writing—original draft preparation, and investigation. HC: writing—review and editing. All authors contributed to the article and approved the submitted version.

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.

Publisher’s note

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.

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Keywords: ADC value, dynamic contrast-enhanced MR imaging, diffusion-weighted MR imaging, breast cancer, molecular subtypes

Citation: Chen H, Li W, Wan C and Zhang J (2022) Correlation of dynamic contrast-enhanced MRI and diffusion-weighted MR imaging with prognostic factors and subtypes of breast cancers. Front. Oncol. 12:942943. doi: 10.3389/fonc.2022.942943

Received: 13 May 2022; Accepted: 12 July 2022;
Published: 05 August 2022.

Edited by:

Benedetta Pellegrino, University of Parma, Italy

Reviewed by:

Matilde Corianò, University of Parma, Italy
Chiara Casartelli, University Hospital of Parma, Italy

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*Correspondence: Jue Zhang, emoxNzc2MjM0NjYwOUAxNjMuY29t

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