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Methylation profile of colon cancer genes in colorectal precursor lesions and tumor tissue: perspectives for screening. | LitMetric

AI Article Synopsis

Article Abstract

Aims: Epigenetic alterations of genes involved in colorectal carcinogenesis are likely to be informative biomarkers for early detection. We assessed the methylation profile of a panel of seven colon cancer-related genes comparing normal colon, colorectal cancer (CRC) precursor lesions and cancer tissues from a Brazilian cohort.

Methods: The cohort comprised 114 CRC patients, including 40 matched normal tissue, 47 patients with adenomas, 33 with serrated polyps and 8 with normal colonic biopsy. DNA methylation status of , , , , , and was determined by pyrosequencing and correlated with clinicopathological features. Sensitivity, specificity, positive predictive value and negative predictive value were calculated for all genes using cancer endpoint.

Results: The most frequently methylated genes in cancer and in precancer lesions were , , and , ranging from 55.3 to 95% of the samples. Overall, the frequency of methylation of these four genes in normal colonic tissue was significantly lower as compared to cancer or precursor lesions both in adenoma-carcinoma ( < .001 and  < .050) and serrated (sessile-serrated lesion) ( < .001 and  < .050) pathways. Additionally, sensitivity for the cancer endpoint ranged from 65.6 to 91.8%, and specificity from 17.9 to 62.9% for , , , and genes. Moreover, the comethylation of ≥4 genes was higher in sessile-serrated lesion (87.5%) and conventional adenomas (78.7%) than in hyperplastic polyps (43.7%) ( = .025) and was significantly associated with proximal cancers ( = .042).

Conclusions: Our study suggests the DNA methylation can constitute potential biomarkers in CRC screening of Brazilian population.

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Source
http://dx.doi.org/10.1080/00365521.2021.1922744DOI Listing

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