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Overall survival by chemotherapy administration status and stage group (Kaplan-Meier) with propensity score weighting. Cox regression–based test for equality of survival curves: (A) stage II with no poor prognostic features: Wald χ2 = 0.01, P = .94; (B) stage II with any poor prognostic features: Wald χ2 = 0.20, P = .65; (C) stage III: Wald χ2 = 232.80, P < .001.
