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Background
The monarchE trial demonstrated improved outcomes with the use of adjuvant abemaciclib in patients with high‐risk hormone receptor–positive, HER2–negative (HR+/HER2–) breast cancer defined as ≥4 positive lymph nodes (+LNs) or one to three +LNs with one or more additional high‐risk features (HRFs). The proportion of patients with one or two positive sentinel lymph nodes (+SLNs) without...