Male patients with a diagnosis of HR+ and HER2- metastatic breast cancer, treated with any CDK 4-6 inhibitor, were included in the study…Median follow-up was 19.53 (95% CI: 14.04-25.02) months. The overall response rate was 60%...In our study, we found that CDK 4-6 inhibitors are effective and safe options in men with HR+ and HER2- metastatic breast cancer, as in women. Our results support the use of CDK 4-6 inhibitor-based combinations in the first-line treatment of HR+ and HER2- metastatic male breast cancer.