Figure 2From: Clinical significance of combined detection of human papilloma virus infection and human telomerase RNA component gene amplification in patients with squamous cell carcinoma of the esophagus in northern ChinaSurvival curves of human papilloma virus-negative and human papilloma virus-positive patients. Human papilloma virus (HPV)-negative group, n = 73; HPV-positive group, n = 19.Back to article page