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Kaplan-Meier of OS and DSS for metastatic head and neck cancer of pharynx patients. (A) OS based on HPV status in mHNSC-P patients. (B) DSS based on HPV status in mHNSC-P patients. aHR means Hazard ratio of HPV-positive vs. HPV-negative patients by adjusting for age, race, gender, grade, T stage, N stage and treatment. 95 %CI means the range of estimates with 95% confidence intervals.
