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Kaplan-Meier estimates for overall survival (A), disease-specific survival (B), and time-to-recurrence (C) by HPV-16 E6 seropositivity. Dashed line, anti–HPV-16 E6 – positive patients; solid line, anti–HPV-16 E6–negative patients; vertical tick marks, censored observations. Based on the log-rank test in unadjusted analyses, P = 0.01 for overall survival, P = 0.02 for disease-specific survival, and P = 0.04 for disease recurrence.
