Mouse Mammary Tumor Virus (MMTV)-Like env Sequence in Brazilian Breast Cancer Samples: Implications in Clinicopathological Parameters in Molecular Subtypes

Nathália de Sousa Pereira, Glauco Akelinghton Freire Vitiello, Bruna Karina Banin-Hirata, Glaura Scantamburlo Alves Fernandes, Maria José Sparça Salles, Marla Karine Amarante and Maria Angelica Ehara Watanabe
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Nathália de Sousa Pereira: Laboratory of DNA Polymorphisms and Immunology, Department of Pathological Sciences, Biological Sciences Center, Londrina State University, Londrina, PR 86057-970, Brazil
Glauco Akelinghton Freire Vitiello: Laboratory of DNA Polymorphisms and Immunology, Department of Pathological Sciences, Biological Sciences Center, Londrina State University, Londrina, PR 86057-970, Brazil
Bruna Karina Banin-Hirata: Laboratory of DNA Polymorphisms and Immunology, Department of Pathological Sciences, Biological Sciences Center, Londrina State University, Londrina, PR 86057-970, Brazil
Glaura Scantamburlo Alves Fernandes: Department of General Biology, Biological Sciences Center, Londrina State University, Londrina, PR 86057-970, Brazil
Maria José Sparça Salles: Department of General Biology, Biological Sciences Center, Londrina State University, Londrina, PR 86057-970, Brazil
Marla Karine Amarante: Laboratory of DNA Polymorphisms and Immunology, Department of Pathological Sciences, Biological Sciences Center, Londrina State University, Londrina, PR 86057-970, Brazil
Maria Angelica Ehara Watanabe: Laboratory of DNA Polymorphisms and Immunology, Department of Pathological Sciences, Biological Sciences Center, Londrina State University, Londrina, PR 86057-970, Brazil

IJERPH, 2020, vol. 17, issue 24, 1-14

Abstract: Background: Breast cancer (BC) is a complex disease in which susceptibility and clinical course depend on multiple factors. Evidence suggests that a mouse mammary tumor virus (MMTV)-homolog may be present in human BCs; however, little is known about its clinical implications. Methods: MMTV-like env nucleotide-sequence was searched in tumor and tumor-adjacent tissues from 217 Brazilian BC patients through nested-PCR and confirmed through PCR-sequencing. Blood samples were also tested for patients with MMTV-like env gene-positive tumors. Correlations with clinicopathological parameters were evaluated. Results: MMTV-like env sequence was detected in tumor and tumor-adjacent tissue samples from 41/217 and 30/196 patients, respectively. In blood, MMTV-like was detected in 17/32 patients. In Luminal-B tumors, MMTV-like in tumor tissue was negatively correlated with tumor size and disease stage, whereas in HER2 tumors it anti-correlated with lymph node metastasis (LNM) and disease stage. Considering blood, MMTV-like env gene positivity negatively correlated with age in general BC, while in Luminal-A tumors it positively correlated with Ki67 but negatively correlated with age and LNM. The associations with decreased LNM frequency were independent of other prognostic factors. Conclusion: MMTV-like env positivity is associated with better prognostic parameters in BC subtypes, which might be explainable by its anti-metastatic potential and by putative activation of immune milieu.

Keywords: breast neoplasia; MMTV; DNA; clinicopathologic parameters; prognosis; virus; carcinogenesis; cancer; epidemiology (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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