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O‐6‐methylguanine‐DNA methyltransferase (MGMT) protein expression in patients with osteosarcoma who experienced recurrence or progression. (A) Patients with osteosarcoma with no MGMT expression (H‐score: 0) and high MGMT expression (H‐score: 270) (magnification, ×200). (C) MGMT protein expression in the 30 patients analyzed.
