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SONIA: Does 1L vs 2L use of CDK4/6 inhibitors improve OS in HR+, ERBB2- ABC?
SONIA: Does 1L vs 2L use of CDK4/6 inhibitors improve OS in HR+, ERBB2- ABC?
24 Apr 2026 byNatalia Reoutova

A phase III randomized clinical trial (RCT) of 1,050 patients with hormone receptor–positive (HR-positive), ERBB2-negative advanced breast cancer (ABC) showed that first-line (1L) use of cyclin-dependent kinase (CDK) 4 and 6 inhibitors did not improve overall survival (OS) compared with second-line (2L) use. At the same time, a post hoc subgroup analysis suggested an OS benefit with 1L use of CDK4/6 inhibitors in premenopausal patients.

SONIA: Does 1L vs 2L use of CDK4/6 inhibitors improve OS in HR+, ERBB2- ABC?
24 Apr 2026