Conflicts of Interest The authors declare no conflicts of interest. References 1, , , et al., “Competing Causes of Death From a Randomized Trial of Extended Adjuvant Endocrine Therapy for Breast Cancer,” Journal of the National Cancer Institute 100, no. 4 (February 2008): 252–260, https://doi.org/10.1093/jnci/djn014. 2, , , , and , “Breast Cancer and Incidence of Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis,” Breast Cancer Research and Treatment 202, no.