The association between colorectal cancer and human papillomavirus (HPV) infection is
still unproven. The aim of this study was to investigate the presence of high-risk
HPV (HR-HPV) DNA in colorectal tissues from Cuban patients. A total of 63 colorectal
formalin-fixed paraffin-embedded tissues were studied (24 adenocarcinoma, 18 adenoma,
and 21 colorectal tissues classified as benign colitis). DNA from colorectal samples
was analysed by quantitative real-time polymerase chain reaction to detect the most
clinically relevant high HR-HPV types (HPV-16, -18, -31, -33, -45, -52, and -58).
Associations between histologic findings and other risk factors were also analysed.
Overall, HPV DNA was detected in 23.8% (15/63) of the samples studied. Viral
infections were detected in 41.7% of adenocarcinoma (10/24) and 27.7% of adenoma
cases (5/18). HPV DNA was not found in any of the negative cases. An association
between histological diagnosis of adenocarcinoma and HPV infection was observed (odd
ratio = 4.85, 95% confidence interval = 1.40-16.80, p = 0.009). The only genotypes
identified were HPV 16 and 33. Viral loads were higher in adenocarcinoma, and these
cases were associated with HPV 16. This study provides molecular evidence of HR-HPV
infection in colorectal adenocarcinoma tissues from Cuban patients.