Male breast cancer in a single-center experience: Diagnosis, clinicopathological features, and treatment strategies

Abstract

Objective: Although breast cancer is the most common cancer type in women worldwide, it is a rare tumor in men, accounting for less than 1% of all male cancers. Therefore, the characteristics of the tumor, the management of the disease, and our overall survival data are quite limited.

Methods: We retrospectively analyzed the data of 51 male patients diagnosed and treated for breast cancer, whose follow-up processes continue, at our hospital. We examined in detail the patients' age, comorbid diseases, history of concomitant malignancies, family history, stage of the disease, tumor size, lymph node status, estrogen receptor (ER)/progesterone receptor (PR) along with Human Epidermal Growth Factor Receptor-2 (HER-2) status. Additionally, we analyzed the type of surgery, history of radiotherapy, and chemotherapy and hormonal treatments in the adjuvant and metastatic periods.

Results: In our study, where we determined a median survival time of 122 months (29-214), we found that the stage at diagnosis, Eastern Cooperative Oncology Group (ECOG) performance status, and discontinuation of adjuvant endocrine therapy significantly affected survival. While the median survival was not reached in stage 1 patients at diagnosis, the median survival times for stage 2, 3, and 4 patients were 118, 83, and 39 months, respectively. The differences between the groups were statistically significant (p=0.005). Similarly, the median survival was not reached for patients with an ECOG performance status of 0, but it was 84 months for those with a status of 1 and 98 months for those with a status of 2. The differences among these three groups were also statistically significant (p=0.001). The median survival was not reached for patients who completed adjuvant endocrine therapy, whereas it was 83 months for those who discontinued the therapy, with the difference being statistically significant (p=0.021). Besides these data, the presence of perineural invasion was found to be a factor close to statistical significance in terms of survival (p=0.066). Histological subgroups, grade, lymphovascular invasion, adjuvant chemotherapy, and Ki-67 were not significant parameters for survival.

Conclusion: Despite the differences in the stage at diagnosis, response to treatments, lower awareness of the disease, older age at diagnosis, and consequently, the increase in accompanying comorbid diseases, male breast cancer is managed according to studies and guideline recommendations for female breast cancer due to the lack of sufficient randomized studies. By presenting our clinical experience, we have emphasized the necessity for further studies in this field.

Keywords: Breast cancer survival; male breast cancer; rare; treatment.