Abstract
The surgical guidelines for male breast cancer (MBC) have been largely guided by female-predominant clinical trials. Because no clinical trial has been conducted to examine the surgical treatment of MBC, we performed a systematic review comparing the survival of patients with MBC who had undergone breast conserving surgery (BCS) and those who had undergone mastectomy and evaluated the patients' radiotherapy compliance after BCS. We performed a systematic search of electronic databases to find MBC cohort studies that had reported ≥ 1 survival outcome (disease-free survival [DFS], disease-specific survival [DSS], or overall survival [OS]) stratified by surgical treatment (BCS and/or mastectomy) and/or radiotherapy compliance with BCS. A total of 1 prospective and 9 retrospective cohort studies were included, with the number of patients ranging from 7 to 6039. Of the BCS patients, compliance with postoperative radiotherapy was low (range, 27%-46%), with the exception of 1 single-institution prospective study that reported 86% compliance (6 of 7 patients). The pooled estimate for all patients with MBC was 83% (95% confidence interval [CI], 78%-88%) for 5-year DSS and 66% (95% CI, 63%-70%) for 5-year OS. Most studies reported no differences in DFS, DSS, or OS for BCS and mastectomy. BCS is a reasonable treatment approach for MBC because it was associated with oncologic outcomes similar to those with mastectomy. However, the low rates of radiotherapy compliance among male patients who underwent BCS is concerning and highlights the importance of shared decision-making with patients with MBC when selecting a surgical treatment strategy.