No evidence of HPV DNA in esophageal squamous cell carcinoma in a population of Southern Brazil |
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Authors: | Luís Carlos Moreira Antunes Jo?o Carlos Prolla Antonio de Barros Lopes Marta Pires da Rocha Renato Borges Fagundes |
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Affiliation: | Luís Carlos Moreira Antunes;Joo Carlos Prolla;Antonio de Barros Lopes;Marta Pires da Rocha;Renato Borges Fagundes;Programa de Pós-Graduao: Ciências em Gastroenterologia e Hepatologia - Universidade Federal do Rio Grande do Sul,Porto Alegre,Rio Grande do Sul 90035-003,Brasil;Hospital Universitário de Santa Maria - Universidade Federal de Santa Maria,Santa Maria,Rio Grande do Sul 97119-900,Brasil;Departamento de Clínica Médica - Universidade Federal de Santa Maria,Santa Maria,Rio Grande do Sul 97119-900,Brasil; |
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Abstract: | AIM: To investigate the association between human papillomavirus (HPV) and esophageal squamous cell carcinoma (ESCC) in southern Brazil.METHODS: We studied 189 esophageal samples from 125 patients from three different groups: (1) 102 biopsies from 51 patients with ESCC, with one sample from the tumor and another from normal esophageal mucosa distant from the tumor; (2) 50 esophageal biopsies from 37 patients with a previous diagnosis of head and neck squamous cell carcinoma (HNSCC); and (3) 37 biopsies from esophageal mucosa with normal appearance from 37 dyspeptic patients, not exposed to smoking or alcohol consumption. Nested-polymerase chain reaction (PCR) with the MY09/11 and GP5/6 L1 primers was used to detect HPV L1 in samples fixed in formalin and stored in paraffin blocks. All PCR reactions were performed with a positive control (cervicovaginal samples), with a negative control (Human Genomic DNA) and with a blank reaction containing all reagents except DNA. We took extreme care to prevent DNA contamination in sample collection, processing, and testing.RESULTS: The histological biopsies confirmed the diagnosis of ESCC in 52 samples (51 from ESCC group and 1 from the HNSCC group) and classified as well differentiated (12/52, 23.1%), moderately differentiated (27/52, 51.9%) or poorly differentiated (7/52, 13.5%). One hundred twenty-eight esophageal biopsies were considered normal (51 from the ESCC group, 42 from the HNSCC group and 35 from dyspeptic patients). Nine had esophagitis (7 from the HNSCC and 2 from dyspeptic patients). Of a total of 189 samples, only 6 samples had insufficient material for PCR analysis: 1 from mucosa distant from the tumor in a patient with ESCC, 3 from patients with HNSCC and 2 from patients without cancer. In 183 samples (96.8%) GAPDH, G3PDH and/or β-globin were amplified, thus indicating the adequacy of the DNA in those samples. HPV DNA was negative in all the 183 samples tested: 52 with ESCC, 9 with esophagitis and 122 with normal esophageal mucosa.CONCLUSION: There was no evidence of HPV infection in different ESCC from southern Brazil. |
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Keywords: | Esophageal cancer Esophageal squamous cell carcinoma Human papillomavirus Head and neck cancer Polymerase chain reactions Nested-polymerase chain reaction |
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