Comparative Analysis of Outcomes and Clinicopathological Characteristics of Synchronous and Metachronous Contralateral Breast Cancer: A Study of the SEER Database

Nomograms predicting all-cause death and cancer-specific death in patients with bilateral primary breast cancer: a study based on Surveillance, Epidemiology, and End Results

Bilateral primary breast cancer (BPBC) patients have a worse prognosis. Tools for accurately predicting mortality risk in patients with BPBC are lacking in clinical practice. We aimed to develop a clinically useful prediction model for the death of BPBC patients. A total of 19,245 BPBC patients from the Surveillance, Epidemiology, and End Results (SEER) database between 2004 and 2015 were randomly divided into the training set (n = 13,471) and test set (5,774). Models for predicting the 1-, 3- and 5-year death risk of BPBC patients were developed. Multivariate Cox regression analysis was used to develop the all-cause death prediction model, and competitive risk analysis was used to establish the cancer-specific death prediction model. The performance of the model was assessed by calculating the area under the receiver operating characteristic curve (AUC) with 95% confidence interval (CI), sensitivity, specificity and accuracy. Age, married status, interval time and first and second tumor's status were associated with both all-cause death and cancer-specific death (all P < 0.05). The AUC of Cox regression models predicted 1-, 3- and 5-year all-cause death was 0.854 (95% CI, 0.835-0.874), 0.838 (95% CI, 0.823-0.852) and 0.799 (95% CI, 0.785-0.812), respectively. The AUC of competitive risk models to predict 1-, 3- and 5-year cancer-specific death was 0.878 (95% CI, 0.859-0.897), 0.866 (95% CI, 0.852-0.879) and 0.854 (95% CI, 0.841-0.867), respectively. Nomograms were developed to predict all-cause death and cancer-specific death in BPBC patients, which may provide tools for clinicians to predict the death risk of BPBC patients.

Racial and Ethnic Disparities in Synchronous and Metachronous Bilateral Breast Cancer

INTRODUCTION

Significant racial and ethnic disparities exist in breast cancer treatment and survival. However, studies characterizing these disparities among patients developing bilateral breast cancers (BBC) are lacking. The purpose of this study is to understand the association between race and ethnicity, sociodemographic factors, clinical variables, treatment, and mortality in patients with BBC--synchronous bilateral breast cancer (sBBC) or metachronous bilateral breast cancer (mBBC).

METHODS

Patients diagnosed with mBBC or sBBC in the Surveillance, Epidemiology, and End Results program between 2010 and 2016 were examined. sBBC was defined as contralateral breast cancer <1 year after the initial cancer diagnosis, and mBBC was contralateral cancer ≥1 year. Univariable analysis examined sociodemographic, clinical, and treatment variables. Kaplan-Meier curves and Cox regression models evaluated disease-specific mortality.

RESULTS

Of the 11,493 patients that met inclusion criteria, 9575 (83.3%) had sBBC, and 1918 (16.7%) had mBBC. There were significant racial and ethnic differences in stage, tumor subtype, surgical management, and chemotherapy within sBBC and mBBC groups. On adjusted multivariate analysis of all BBC patients, Black race (HR 1.42; 95%CI 1.11-1.80; p<0.005; Ref White) was associated with a higher disease-specific mortality. Conversely, patients with mBBC had a 25% relative risk reduction in disease-specific mortality (HR 0.75; 95%CI 0.61-0.92; p<0.01) compared to sBBC. Subset analysis suggested Black Race modified the effect of sBBC on mortality (p<0.0001).

CONCLUSIONS

Among patients with BBC, there are racial and ethnic disparities in clinical characteristics, treatment, and mortality. Future studies should focus on strategies to reduce these disparities.

A comparative clinicopathological and survival analysis of synchronous bilateral breast cancers

OBJECTIVE

The present study aimed to explore the clinicopathological characteristics, potential heterogeneity and prognostic factors in synchronous bilateral breast cancer (SBBC).

METHODS

We performed a retrospective review and paired comparison of the clinicopathological characteristics of 114 patients with SBBC in the Peking Union Medical College Hospital from January 2008 to September 2019. The prognostic significance of triple negativity status and coexistence ductal carcinoma in situ (DCIS) with bilateral invasive ductal carcinomas of no special type (IDC-NST) was analyzed in SBBC.

RESULTS

Most bilateral lesions on both sides were of IDC-NST, grade 2, luminal subtype, and stage I. Although most lesions were concordant between the left and right side, discordances were observed in histological type (25 cases, 21.9%), histological grade (31 cases, 27.2%), pTNM (61 cases, 53.5%), molecular subtypes (20 cases, 17.5%), and immunohistochemical staining of ER (18 cases, 15.8%), PR (26 cases, 22.8%), and HER2 (12 cases, 10.5%). Moreover, there was no significant difference in disease-free survival (DFS) and overall survival (OS) between IDC-NST with coexisting DCIS on both sides and IDC-NST with coexisting DCIS on one side or pure IDC-NST. SBBC with triple negativity on both sides exhibited a significantly shorter DFS and OS when compared with triple negativity on one side or non-triple negativity on both sides (p<0.001), and remained an independent prognostic factor by multivariate analysis.

CONCLUSIONS

A considerable proportion of discordance in clinicopathological characteristics is observed in SBBC, supporting the necessity of comprehensive pathological examination including immunohistochemical testing on both sides in clinical practice. Moreover, SBBC with triple negativity on both sides is a prognostic for poor survival.

Association of molecular subtype concordance and survival outcome in synchronous and metachronous bilateral breast cancer

Background

The aim of this study was to analyze the association of molecular subtype concordance and disease outcome in patients with synchronous bilateral breast cancer (SBBC) and metachronous breast cancer (MBBC).

Patients and methods

Patients diagnosed with SBBC or MBBC in the Surveillance, Epidemiology, and End Results (SEER) database or Comprehensive Breast Health Center (CBHC) Ruijin Hospital, Shanghai were retrospectively reviewed and included. Clinicopathologic features, molecular subtype status concordance, and prognosis were compared in patients with SBBC and MBBC. Other prognostic factors for breast cancer-specific survival (BCSS) and overall survival (OS) were also identified for bilateral breast cancer patients.

Results

Totally, 3395 and 115 patients were included from the SEER and Ruijin CBHC cohorts. Molecular subtype concordance rate was higher in the SBBC group compared to MBBC in both SEER cohort (75.8% vs 57.7%, p < 0.001) and Ruijin CBHC cohort (76.2% vs 45.2%, p = 0.002). Survival analyses indicated that SBBC was related to worse BCSS than MBBC (p = 0.015). Molecular subtype discordance was related to worse BCSS (hazard ratio (HR), 1.64, 95% confidential interval (CI), 1.18–2.27, p = 0.003) and OS (HR, 1.59, 95% CI, 1.24–2.04, p < 0.001) in the SBBC group, but not for the MBBC group (p = 0.650 for BCSS, p = 0.669 for OS).

Conclusions

Molecular subtype concordance rate was higher in the SBBC group than MBBC group. Patients with discordant molecular subtype was associated with worse disease outcome in the SBBC patients, but not in MBBC, which deserves further clinical evaluation.

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SBBC was associated with higher concordance rates of ER, PR, HER2, and molecular subtype status compared to MBBC.

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SBBC had worse BCSS than MBBC.

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Molecular subtype discordance was independently related to worse prognosis in SBBC but has no impact on prognosis of MBBC.

Clinical characteristics and clinicopathological correlations of bilateral breast cancer in China: A multicenter study from Chinese Society of Breast Surgery (CSBrS-006)

Objective

To investigate the clinical characteristics and clinicopathological correlations of bilateral breast cancer (BBC) in China.

Methods

Data of 440 patients diagnosed with BBC in 2018 were collected from 33 centers of the Chinese Society of Breast Surgery. Demographic characteristics, bilateral tumor characteristics, and comprehensive treatment data were obtained. Correlations between the clinicopathological characteristics of bilateral tumors were analyzed.

Results

The proportion of BBC was 0.22%−3.08%. A total of 33 (7.5%) patients had a family history of malignant tumors, 304 (69.1%) patients had synchronous BBC. Only 1 (0.2%) patient was male. More than half of all patients received concurrent or asynchronous endocrine/chemotherapy, 32.5% of all human epidermal growth factor receptor 2 (HER2)-positive patients received HER2-targeted therapy, and approximately 21.6% of all patients received radiotherapy. The most common pathological cancer type was invasive ductal cancer (>60%). Approximately 70% of all patients had bilateral hormone receptor (HR)-positive tumors and presented with a single breast mass. Significant correlations were found with pathological type, histological grade, locations of tumor, molecular subtype, Ki-67 index, tumor site and size of bilateral tumors. Results of the subgroup analysis showed more clinicopathological characteristics when synchronous BBC was compared with metachronous BBC.

Conclusions

In China, the clinicopathological characteristics of bilateral tumors showed significant correlations, and more significant clinicopathological correlations were observed when synchronous BBC was compared with metachronous BBC.

Clinicopathological Characteristics, Treatment and Outcome of 123 Patients with Synchronous or Metachronous Bilateral Breast Cancer in a Swiss Institutional Retrospective Series

Objective

To evaluate the prognosis, the patient and tumor characteristics, and the treatment of bilateral breast cancer (BBC) and to compare synchronous (sBBC) and metachronous BBC (mBBC).

Materials and Methods

For this retrospective study, data from 123 consecutive BBC patients (56 sBBC and 67 mBBC) that were presented at the Sion Hospital tumor board between 2007 and 2018 were collected retrospectively.

Results

Mean follow-up was 85 months. 2^nd tumors in both groups were more often diagnosed radiologically. Mean time interval between mBBC was 115 months. A shorter interval was positively correlated with a negative hormonal receptor (HR) status and higher grade for the 2^nd tumor. There was no difference in overall survival (OS) and relapse-free survival (RFS) between sBBC and mBBC. OS was longer if both tumors were hormonal receptor (HR) positive. mBBC exhibited a higher local recurrence rate than sBBC (p=0.03).

Conclusion

sBBC and mBBC patients did not show any difference in OS or RFS, although mBBC patients were more prone to local relapses.

Worse characteristics can predict survival effectively in bilateral primary breast cancer: A competing risk nomogram using the SEER database

Objective

There is limited information from population‐based cancer registries regarding prognostic features of bilateral primary breast cancer (BPBC).

Methods

Female patients diagnosed with BPBC between 2004 and 2014 were randomly divided into training (n = 7740) and validation (n = 2579) cohorts from the Surveillance, Epidemiology, and End Results Database. We proposed five various models. Multivariate Cox hazard regression and competing risk analysis were to explore prognosis factors in training cohort. Competing risk nomograms were constructed to combine significant prognostic factors to predict the 3‐year and the 5‐year survival of patients with BPBC. At last, in the validation cohort, the new score performance was evaluated with respect to the area under curve, concordance index, net reclassification index and calibration curve.

Results

We found out that age, interval time, lymph nodes invasion, tumor size, tumor grade and estrogen receptor status were independent prognostic factors in both multivariate Cox hazard regression analysis and competing risk analysis. Concordance index in the model of the worse characteristics was 0.816 (95% CI: 0.791‐0.840), of the bilateral tumors was 0.819 (95% CI: 0.793‐0.844), of the worse tumor was 0.807 (0.782‐0.832), of the first tumor was 0.744 (0.728‐0.763) and of the second tumor was 0.778 (0.762‐0.794). Net reclassification index of the 3‐year and the 5‐year between them was 2.7% and −1.0%. The calibration curves showed high concordance between the nomogram prediction and actual observation.

Conclusion

The prognosis of BPBC depended on bilateral tumors. The competing risk nomogram of the model of the worse characteristics may help clinicians predict survival simply and effectively. Metachronous bilateral breast cancer presented poorer survival than synchronous bilateral breast cancer.