Mismatch Repair Proteins in Oropharyngeal Squamous Cell Carcinoma: A Retrospective Observational Study

Overview

Journal Head Neck Pathol

Specialties Oncology
Pathology

Date 2021 Jan 27

PMID 33501557

Citations 1

Authors

Osias Vieira de Oliveira Filho

Thinali Sousa Dantas

Isabelle Joyce de Lima Silva-Fernandes

Maria do Perpetuo Socorro Saldanha Cunha

Ana Paula Negreiros Nunes Alves

Mario Rogerio Lima Mota

Paulo Goberlanio de Barros Silva

Fabricio Bitu Sousa

Affiliations

Soon will be listed here.

Abstract

Cases of oropharyngeal squamous cell carcinoma are on the rise and the disease now ranks as the most common human papillomavirus-related cancer. Although risk factors have been extensively discussed in the literature, the role of the DNA mismatch repair system remains unanswered. To evaluate the impact of the DNA mismatch repair (MMR) protein immunostaining on the tumor progression and prognosis of oropharyngeal squamous cell carcinoma (OPSCC). This retrospective observational study comprised 50 cases of OPSCC. Immunohistochemistry for MSH2, MSH6, PMS2, MLH1, Ki67, p16 and caspase-3 was performed. The expression of these proteins was assessed in surgical resection margins, primary tumor (PT), and lymph node metastasis (LNM) of p16+ and p16- OPSCC. Clinical-pathological involvement in immunostaining was evaluated with Kruskal-Wallis/Dunn or Mann-Whitney test, Wilcoxon test and Spearman's correlation. Overall survival (OS) was analyzed with Log-Rank Mantel-Cox and Cox regression. MSH6 and caspase-3 showed high expression in PT (p16+ and p16 -) and in LNM (p16+ and p16-), and high levels of MSH2 were found in LNM (p16+ and p16 -). An imbalance in MutSα also was observed. PMS2 and caspase-3 expression was associated with poor survival in p16- OPSCC and, in multivariate analysis, MSH2, MSH6 and MLH1 had the poorest prognostic impact in p16+ OPSCC. MMR protein immunostaining is involved in OPSCC progression, dissemination and prognosis. The overexpression of MMR proteins as a response to increased DNA mismatch caused by cell proliferation and MSH2, MSH6 and MLH1 proteins might constitute a prognostic marker in p16+ OPSCC.

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