**5. Conclusions**

In this population-based study of men with breast cancer, treatment with chemotherapy was significantly associated with elevated risk of CVD mortality, with the highest risk observed among Hispanic men. These findings have important implications for cardiooncology care as well as extending research in the context of noncancerous outcomes in men with breast cancer. With the proportion of cancer patients receiving radiation therapy and chemotherapy increasing over the past few decades [16], future studies on cardiovascular outcomes due to cancer treatment regimens among racially and ethnically diverse MBC patients are warranted to enhance the clinical managemen<sup>t</sup> of breast cancer in men.

**Author Contributions:** Conceptualization, D.A., M.M. and K.P.; methodology, D.A., M.M. and K.P.; formal analysis, D.A.; investigation, D.A.; resources, D.A., M.M. and K.P.; data curation, D.A.; writing—original draft preparation, D.A.; writing—review and editing, D.A., M.M. and K.P.; supervision, D.A. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding. **Institutional Review Board Statement:** Institutional review board approval was not required for this study as the SEER registry is a de-identified publicly available database.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Data used for this study are publicly available from the National Cancer Institute at https://seer.cancer.gov/, accessed on 20 November 2022.

**Conflicts of Interest:** The authors declare no conflict of interest.
