RecruitingPhase 2Drug trialImpact of Omitting Chemo Based on Patient's Selection for ER-Positive, HER2-Negative Breast Cancer With Ribociclib and Endocrine TherapyThis is a Phase II, two-arm, single center, patient preference study designed to evaluate the impact of omitting adjuvant chemotherapy in moderate to high-anatomical risk, low-genomic risk (men or premenopausal women T2-3N0 and RS 16-25, or T1-3N1-2 and RS ≤ 25, and postmenopausal women T2-3N0 and RS 26-30, or T1-3N1 and RS 26-30, or T1-3N2 and RS ≤ 25),