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Kaplan-Meier estimates for overall survival (A), disease-specific survival (B), and time-to-recurrence (C) by HPV DNA tumor status (Bx, biopsy). Dashed line, HPV DNA–positive tumors; solid line, HPV-negative tumors; vertical tick marks, censored observations. Based on the log-rank test in unadjusted analyses, P = 0.04 for overall survival, P = 0.17 for disease-specific survival, and P = 0.13 for disease recurrence.
