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Kaplan-Meier estimates of postrecurrence survival according to the serum squamous cell carcinoma antigen (SCC-Ag) level in patients with (A) pelvic central, single distant, or lymph node recurrences and (B) pelvic sidewall or multiple recurrences. Kaplan-Meier estimates of postrecurrence survival according to salvage treatment in patients with (C) serum SCC-Ag levels<14.0 ng/mL and (D) serum SCC-Ag levels ≥ 14.0 ng/mL.
