Fig. 4From: Rising incidence of HPV positive oropharyngeal cancer in Taiwan between 1999 and 2014 where betel nut chewing is commonOverall survival curves of the OPC patients stratified by HPV PCR testing (a) and p16 IHC staining (b) in Taiwan. Impact of betel nut/cigarette (BC) exposure on the overall survival of HPV positive OPC patients (c)Back to article page