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Overall survival of patients with anal canal carcinoma treated with chemoradiation: (A) 1 (mmc1) compared with 2 (mmc2) cycles of mitomycin C; (B) Eastern Cooperative Oncology Group (ecog) performance status 0 compared with ≥1; (C) stage T1/2 compared with T3/4; (D) stage N0 compared with N1–3.
