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Kaplan-Meier curves of overall survival in patients with visceral (lung and/or liver) metastasis. sIPTW analysis (A) and PSM analysis (B); number of patients at risk are shown. LET, letrozole; NR, not reached; OS, overall survival; PAL, palbociclib; PSM, propensity score matching; sIPTW, stabilized inverse probability treatment weighting.
