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Gastroenterology Research and Practice
Volume 2016, Article ID 7896716, 8 pages
http://dx.doi.org/10.1155/2016/7896716
Research Article

High Prevalence of Human Papillomavirus in Colorectal Cancer in Hispanics: A Case-Control Study

1School of Health Professions, University of Puerto Rico Medical Sciences Campus, San Juan, PR 00935, USA
2Division of Gastrointestinal Oncology, University of Puerto Rico Comprehensive Cancer Center, San Juan, PR 00935, USA
3AIDS Research Program, Ponce Health Sciences University School of Medicine, Ponce, PR, USA
4Department of Surgery, Biochemistry and Medicine, University of Puerto Rico Medical Sciences Campus, San Juan, PR 00716, USA

Received 2 July 2015; Accepted 11 October 2015

Academic Editor: Miguel Pera

Copyright © 2016 Raul D. Bernabe-Dones et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The role of Human Papillomavirus (HPV) in colorectal carcinogenesis remains elusive. Based on the high incidence of HPV-associated malignancies among Puerto Rican Hispanics, this study aimed to assess the prevalence of HPV infection and viral integration in colorectal tissues in order to evaluate its putative role in colorectal cancer (CRC). In this case-control study, the prevalence of HPV infection in CRC (cases n = 45) and normal colon mucosa from cancer-free subjects (controls n = 36) was assessed by a nested PCR strategy. HPV-16 genotyping was performed in HPV-positive tissues and the physical status of the HPV-16 genome was determined by E2 detection. HPV was detected in 19 of 45 (42.2%) CRC cases (mean age 61.1 ± 10.7 years, 24 males) and in 1 of 36 (2.8%) controls (mean age 60.9 ± 9.6 years, 24 males) with an OR = 25.58 (95% CI 3.21 to 203.49). HPV-16 was detected in 63.2% of the HPV-positive colorectal tumors; genome integration was observed in all HPV-16 positive cases. This is the first report showing the high prevalence of HPV infections in Caribbean Hispanic colorectal tumors. Despite evidence of HPV integration into the host genome, further mechanistic analysis examining HPV oncoprotein expression and the putative role of these oncoproteins in colorectal carcinogenesis is warranted.