BACKGROUND: Although the role of viral agents, such as human papillomavirus (e.g. HPV16, HPV18) in colorectal cancer (CRC) has been previously investigated, results remain inconclusive. METHODS: To further evaluate the involvement of oncogenic HPV types in CRC, 40 frozen neoplastic and 40 adjacent colonic tissues collected from Italian patients were analyzed by Luminex-based assays that detect a broad spectrum of HPV types, i.e. Alpha (n = 21), Beta (n = 46) and Gamma HPVs (n = 52). In addition, 125 frozen CRC samples and 70 surrounding mucosal tissues were collected from Czech patients and analyzed by broad spectrum PCR protocols: (i) FAP59/64, (ii) FAPM1 and (iii) CUT combined with Next Generation Sequencing (NGS). RESULTS: Using Luminex-basedassays, DNA from HPV16 was detected in 5% (2/40) CRC tissues from Italian patients. One HPV16 DNA-positive CRC case was subsequently confirmed positive for E6*I mRNA. Cutaneous beta HPV types were detected in 10% (4/40) adjacent tissues only, namely HPV111 (n = 3) and HPV120 (n = 1), while gamma HPV168 (n = 1) and HPV199 (n = 1) types were detected in adjacent and in tumor tissues, respectively. The NGS analysis of the CRC Czech samples identified HPV sequences from mucosal alpha-3 (HPV89), alpha-7 (HPV18, 39, 68 and 70) and alpha-10 species (HPV11), as well as cutaneous beta-1 (HPV20, 24, 93, 98, 105,124) beta-2 (HPV23), beta-3 (HPV49) and gamma-1 species (HPV205). CONCLUSIONS: Our findings indicate that HPV types belonging to the mucosal alpha, and the 'cutaneous' beta and gamma genera can be detected in the colonic mucosal samples with a low prevalence rate and a low number of HPV reads by Luminex and NGS, respectively. However, additional studies are required to corroborate these findings.

Biomedical Center Faculty of Medicine in Pilsen Charles University Pilsen Czech Republic

Cancer Biology and Therapeutics Group School of Biomolecular and Biomedical Science UCD Conway Institute University College Dublin Dublin Ireland

Department of Experimental Oncology IEO European Institute of Oncology IRCCS Milan Italy

Department of Infectious Diseases Istituto Superiore di Sanità Viale Regina Elena 299 Rome Italy

Department of Surgery Faculty Hospital and Faculty of Medicine in Pilsen Charles University Pilsen Czech Republic

Institutional BioBank Istituto Tumori Giovanni Paolo 2 IRCCS Bari Italy

International Agency for Research on Cancer 25 Avenue Tony Garnier CS 90627 69366 Lyon Cedex 07 France

Leibniz Institute of Virology Hamburg Germany

Pathology Department IRCCS Istituto Tumori Giovanni Paolo 2 Bari Italy

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