Figure 1. Survival rates for patients with human papillomavirus (HPV)–positive tonsillar cancer compared with those for patients with HPV-negative cancer. Circles indicate patients who died of tonsillar cancer during the follow-up period; plus signs indicate patients who were removed from the study for other reasons (e.g., died from a cause other than tonsillar cancer, left the country); p<0.0005. Data from Lindquist et al. (13), with permission of Elsevier (www.elsevier.com).
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