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Published in: Familial Cancer 2/2010

01-06-2010

Mismatch repair protein expression and colorectal cancer in Hispanics from Puerto Rico

Authors: Wilfredo E. De Jesus-Monge, Carmen Gonzalez-Keelan, Ronghua Zhao, Stanley R. Hamilton, Miguel Rodriguez-Bigas, Marcia Cruz-Correa

Published in: Familial Cancer | Issue 2/2010

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Abstract

Colorectal cancer (CRC) is a leading cause of morbidity and mortality and alterations in mismatch repair (MMR) genes, leading to absent protein (negative) expression, are responsible for approximately 20% of CRC cases. Immunohistochemistry is a tool for prescreening of MMR protein expression in CRC but the literature on its use on Hispanics is scarce. However, Hispanics represent the second leading ethnicity in the United States (US) and CRC is a public health burden in this group. Our objectives were to determine the frequency of MMR protein-negative CRC and to evaluate its association with clinical and pathological characteristics among Hispanics from Puerto Rico, for the first time to our knowledge. A retrospective observational study of unselected CRC patients from the Puerto Rico Medical Center from 2001 to 2005 was done. MLH1 and MSH2, the most commonly altered MMR genes, protein expression was evaluated using immunohistochemistry, with microsatellite instability (MSI) and BRAF gene analyses in the absence of MLH1 protein expression. One-hundred sixty-four CRC patients were evaluated: the overall MMR protein-negative frequency was 4.3%, with 0.6% frequency of co-occurrence of MLH1-protein negative expression, MSI-high, and normal BRAF gene. MMR protein-negative expression was associated with proximal colon location (P = 0.02) and poor histological tumor differentiation (P = 0.001), but not with other characteristics. The frequency of MMR protein-negative CRC in Hispanics from Puerto Rico was lower than reported in other populations. This finding may explain the lower CRC incidence rate among US Hispanics as compared to US non-Hispanic whites and blacks.
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Metadata
Title
Mismatch repair protein expression and colorectal cancer in Hispanics from Puerto Rico
Authors
Wilfredo E. De Jesus-Monge
Carmen Gonzalez-Keelan
Ronghua Zhao
Stanley R. Hamilton
Miguel Rodriguez-Bigas
Marcia Cruz-Correa
Publication date
01-06-2010
Publisher
Springer Netherlands
Published in
Familial Cancer / Issue 2/2010
Print ISSN: 1389-9600
Electronic ISSN: 1573-7292
DOI
https://doi.org/10.1007/s10689-009-9310-4

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