Molecular alterations associated with rapid progression following CDK4/6 inhibitors (CDKi) in metastatic hormone receptor–positive breast cancer (mHRBC).
Abstract:1054 Background: Combination of CDKi with endocrine therapy is a key treatment for mHRBC due to survival benefit and favorable safety profile. However, progressive disease inevitably develops and outcomes after CDKi discontinuation (dc) are not well-described. Within our institution, we previously reported clinical characteristics and outcomes for a cohort of 140 mHRBC patients who received CDKi therapy. Median progression-free survival (PFS) and overall survival (OS) post-CDKi dc were 7.0 and 15.4 months, re… Show more
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