Risk factors related to human papillomavirus infection in oral squamous cell carcinoma Alberto Rodriguez-Archilla, Adriana Stuardo-Parada Archives of Medicine and Health Sciences 2019 7(1):33-37 Background: In addition to tobacco and alcohol consumption, some infectious pathogens such as human papillomavirus (HPV) have been proposed as carcinogenic factors in oral cancer. Objective: The objective of the study is to assess the possible influence of HPV detection in oral squamous cell carcinoma (OSCC). Materials and Methods: A PubMed search through April 2018, using the following Medical Subject Headings terms, was performed: “mouth neoplasms” and “papillomavirus infections.” Studies with findings on HPV detection in OSCCs were assessed. From 77 studies with full-text availability, 59 were excluded for several reasons: no usable/irrelevant data (32), tonsils, base of tongue and non-OSCC cases studies (26), and animal testing studies (1). The data were analyzed using statistical software RevMan 5.3 (The Cochrane Collaboration, Oxford, UK). For dichotomous outcomes, the estimates of effects of an intervention were expressed as odds ratios (ORs) using Haenszel–Mantel method with 95% confidence intervals. Results: Eighteen studies on HPV detection in OSCCs were included in this meta-analysis. The mean percentage of HPV detection in OSCC was 37.1%. Oral cancer patients showed a higher risk of being infected with HPV than controls (OR: 4.85) and they were more likely to be infected with high-risk HPV (OR: 11.46). A larger number of smokers had HPV-infected tumors (OR: 1.45). Younger age, gender, tobacco and/or alcohol consumption, tumor differentiation degree, tumor size (T-status), and lymph node metastasis (N-status) were factors that did not have a significant influence on HPV-infected oral cancers. Conclusion: HPV infection, especially of high-risk HPV, is more frequent in patients with OSCC.