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Combined methylation of p16 and hMLH1 (CMETH2) discriminates a subpopulation with better prognosis in colorectal cancer patients with microsatellite instability tumors

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Tumor Biology

Abstract

The aim of this study was to determine the frequency of p16 and hMLH1 genes simultaneous methylation in colorectal cancer patients with Microsatellite Instability (MSI) tumors. We also wanted to analyze the relationship with other clinical features, with BRAF gene V600E mutation and with prognosis. Samples from fifty one patients with MSI positive sporadic colorectal cancer were included. DNA was extracted from tumor samples. Promoter methylation was analyzed using bisulfite modification and was detected by quantitative methylation-specific PCR. BRAF gene was amplified using specific primers and mutations were detected by real time PCR. Simultaneous methylation was transformed in a new variable called CMETH2. Frequency of CMETH2 was analyzed and compared with other clinicopathological variables. 33.3 % of patients were positive for CMETH2 and 25 % had BRAF V600E mutation. CMETH2 was related with proximal location, with poorly differentiated tumors and with BRAF V600E mutation. CMETH2 only showed influence in the overall survival (OS) in patients with distal tumors. However, with regard to the disease free survival (DFS) measure, CMETH2 was independent prognostic factor. We were able to discriminate tumors with high methylation features using a transformation analysis of variables into a new computed one (CMETH2). CMETH2 has demonstrated to be a useful prognostic factor in MSI tumors. The prognostic value of CMETH2 in DFS was independent of other clinicopathological variables. The use of CMETH2 could help in the election of the best therapeutic alternative for CCR patients with MSI tumors.

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Authors and Affiliations

  1. Department of Clinical Analysis, Genomic Section, Hospital Clínico San Carlos, c/ Martín Lagos s/n, 28040, Madrid, Spain

    S. Veganzones, M. L. Maestro, S. Rafael, V. de la Orden, M. Vidaurreta & B. Mediero

  2. Department of Documentation, Hospital Clínico San Carlos, Madrid, Spain

    M. Espantaleón

  3. Department of General Surgery, Hospital Clínico San Carlos, Madrid, Spain

    J. Cerdán

  4. Department of Medical Oncology, Instituto Investigación Biomédica, Hospital Clínico San Carlos, Madrid, Spain

    E. Díaz-Rubio

  5. Department of Medicine, Facultad Medicina Universidad Complutense, Center Affiliated to the Red Tematica de Investigacion Cooperativa (RD/12/0036/006), Instituto Carlos III, Spanish Ministery of Economy and Competitivy, Madrid, Spain

    E. Díaz-Rubio

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  1. S. Veganzones
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  2. M. L. Maestro
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Correspondence to M. L. Maestro.

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Veganzones, S., Maestro, M.L., Rafael, S. et al. Combined methylation of p16 and hMLH1 (CMETH2) discriminates a subpopulation with better prognosis in colorectal cancer patients with microsatellite instability tumors. Tumor Biol. 36, 3853–3861 (2015). https://doi.org/10.1007/s13277-014-3027-1

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