Abstract

Purpose: The CDK4/6 inhibitors, palbocilib [1] and ribociclib [2,3], have shown significant improvements in progression-free survival (PFS) in ER+/HER2– advanced breast cancers. In the MONALEESA-2 trial, ribociclib showed a significant median overall survival (OS) of 63.9 months [4]. However, in the PALOMA-2 study [5], palbociclib showed a median OS of 53.9 months that was non-significant. The observed differences in OS have generated uncertainty around which CDK4/6 inhibitor to choose in routine clinical practice. In this context, real-world data analysis can be a useful guide to therapy.

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