Fig. 2From: Combination of smoking and Epstein-Barr virus DNA is a predictor of poor prognosis for nasopharyngeal carcinoma: a long-term follow-up retrospective studyKaplan-Meier curves for the secondary endpoint survival outcomes of male patients stratified by different smoking indicators. a Progression-free survival. b Locoregional relapse-free survival. c Distant metastasis-free survivalBack to article page