Figure 2From: The incidence and risk of developing a second primary esophageal cancer in patients with oral and pharyngeal carcinoma: a population-based study in Taiwan over a 25 year period Kaplan-Meier survival curves of all the patients stratified by index tumor site in the oral cavity (26,166 cases), oropharynx (3,403 cases) and hypopharynx (4,218 cases).Back to article page