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Kaplan‐Meier curves of PFS. A, PFS by stage of disease; B, PFS by IPI; C, PFS by Ki‐67 expression. The Breslow test found no differences among the groups (P = .656 for stage, P = .160 for IPI, and P = .825 for Ki‐67 expression). Abbreviations: IPI, international prognostic index; PFS, progression‐free survival
