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Gene Expression Differences Associated with Human Papillomavirus Status in Head and Neck Squamous Cell Carcinoma

Authors' Affiliations: Departments of ¹ Cancer Biology, ² Otolaryngology, ³ Pathology, ⁴ Biostatistics, ⁵ Radiation Oncology, and ⁶ Biomedical Informatics; Divisions of ⁷ Genetic Medicine and ⁸ Hematology/Oncology, Department of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee

Requests for reprints: Christine H. Chung, Division of Hematology/Oncology, Department of Medicine, Vanderbilt University School of Medicine, 2220 Pierce Avenue, 777 Preston Research Building, Nashville, TN 37232-6307. Phone: 615-322-4967; Fax: 615-343-7602; E-mail: Christine.Chung{at}Vanderbilt.edu.

Human papillomavirus (HPV) is associated with a subset of head and neck squamous cell carcinoma (HNSCC). Between 15% and 35% of HNSCCs harbor HPV DNA. Demographic and exposure differences between HPV-positive (HPV⁺) and negative (HPV^–) HNSCCs suggest that HPV⁺ tumors may constitute a subclass with different biology, whereas clinical differences have also been observed. Gene expression profiles of HPV⁺ and HPV^– tumors were compared with further exploration of the biological effect of HPV in HNSCC. Thirty-six HNSCC tumors were analyzed using Affymetrix Human 133U Plus 2.0 GeneChip and for HPV by PCR and real-time PCR. Eight of 36 (22%) tumors were positive for HPV subtype 16. Statistical analysis using Significance Analysis of Microarrays based on HPV status as a supervising variable resulted in a list of 91 genes that were differentially expressed with statistical significance. Results for a subset of these genes were verified by real-time PCR. Genes highly expressed in HPV⁺ samples included cell cycle regulators (p16^INK4A, p18, and CDC7) and transcription factors (TAF7L, RFC4, RPA2, and TFDP2). The microarray data were also investigated by mapping genes by chromosomal location (DIGMAP). A large number of genes on chromosome 3q24-qter had high levels of expression in HPV⁺ tumors. Further investigation of differentially expressed genes may reveal the unique pathways in HPV⁺ tumors that may explain the different natural history and biological properties of these tumors. These properties may be exploited as a target of novel therapeutic agents in HNSCC treatment.

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