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Kaplan-Meier survival analysis. (A) PFS for all groups. (B) OS for all groups. (C) PFS comparing the primary lung tumor group and the extrapulmonary tumor group. (D) OS comparing the primary lung tumor group and the extrapulmonary tumor group. mPFS, median progression-free survival; mOS, median overall survival; m, months; NR, not reached; SBRT, stereotactic body radiotherapy.
