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Post-relapse survival (PRS) distributions according to time to first relapse (A) and ability to achieve second complete remission (B) for all 110 patients with relapsed osteosarcoma, and according to laterality of relapse for patients with lung relapse only who achieved second complete remission (CR2) (C). Post-relapse event-free survival (PREFS) distributions according to chemotherapy use at first relapse for patients with relapsed osteosarcoma who did not achieve CR2 (D).
