Fig. 4: Kaplan–Meier curves of real-world progression-free survival 2.

Graphical representation of rwPFS 2 in a the unadjusted population, b following sIPTW, and c following PSM. AI aromatase inhibitor, CI confidence interval, PAL palbociclib, PSM propensity score matching, rwPFS2 real-world progression-free survival 2, sIPTW stabilized inverse probability of treatment weighting.