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Assessment of microsatellite instability in colorectal cancer patients from Brazil

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Abstract

The replication error status analysis of DNA, through microsatellite instability detection, has become an indispensable tool for hereditary non-polyposis colorectal cancer screening. This study investigated the microsatellite instability in Brazilian individuals presenting colorectal cancer. In this study, 66 patients were clinically analyzed according to Amsterdam II and Bethesda guidelines. Normal and tumour tissues were collected and analyzed for MSI degree according to molecular markers BAT25, BAT26, BAT40, APC–D5S346, D2S123, and D17S250. Eight patients (12.1%) fulfilled the Amsterdam II guidelines, and 15 (22.7%) met the Bethesda guidelines. BAT25 was the most sensitive marker (86.7%), while BAT26 was the least sensitive (66.7%). The specificity of both markers was 100%, but all of the markers must be used since the contribution of each marker to the sensitivity and specificity of the test is complementary. Proximal tumours were significantly predominant among RER+ patients. Conclusions: Patients with a family history of colorectal cancer with the tumour in the proximal colon must be screened to replication error status as early as possible in order to avoid the progression of the disease.

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Authors and Affiliations

  1. Department of Coloproctology, Santa Casa de Belo Horizonte, MG, Brazil

    Sinara M. O. Leite & Geraldo M. G. Cruz

  2. COLTEC, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil

    Karina B. Gomes

  3. Department of Human Genetics, Instituto H. Pardini, Belo Horizonte, MG, Brazil

    Victor C. Pardini, Alessandro C. S. Ferreira & Vanessa C. Oliveira

  4. Av. Contorno 4747/912, Serra Belo Horizonte, MG, 30110-090, Brazil

    Sinara M. O. Leite

Authors
  1. Sinara M. O. Leite
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  2. Karina B. Gomes
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  3. Victor C. Pardini
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  4. Alessandro C. S. Ferreira
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  5. Vanessa C. Oliveira
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  6. Geraldo M. G. Cruz
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Correspondence to Sinara M. O. Leite.

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Leite, S.M.O., Gomes, K.B., Pardini, V.C. et al. Assessment of microsatellite instability in colorectal cancer patients from Brazil. Mol Biol Rep 37, 375–380 (2010). https://doi.org/10.1007/s11033-009-9807-9

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  • DOI: https://doi.org/10.1007/s11033-009-9807-9

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