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Subgroup analysis of prognostic factors using Kaplan-Meier curves for OS and PFS. (A) Effect of prior immunotherapy on PFS in all groups. (B) Effect of metastasis distribution on PFS in all groups. (C) Effect of metastasis number on PFS. (D) Effect of prior immunotherapy on OS in all groups. mPFS, median progression-free survival; mOS, median overall survival; m, months; NR, not reached; SBRT, stereotactic body radiotherapy.
