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HPV infection among non-metastatic ASCC. (A) Donut chart representing the percentage of HPV-negative and HPV-positive cases (low- and high-risk groups); (B) Distribution of HPV genotypes among ASCC HPV-positive cases. About 22% of the patients harboring HPV-16 were infected with multiple genotypes; (C) Prevalence of HPV-negative, high-risk and low-risk HPV infection according to HIV status.
