How long do you give adjuvant hormonal therapy for women over 70 with breast cancer treated with lumpectomy only?

It is always difficult to make a recommendation for endocrine therapy duration when optimal duration is unknown. Looking at CALGB 9343 (Hughes et al, JCO 2013), in which women with stage I cancers were randomly assigned to either tamoxifen plus radiation or tamoxifen alone, we know that the risk of ...