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World J Gastrointest Oncol. 2016 Jan 15;8(1):83-98. doi: 10.4251/wjgo.v8.i1.83.

Molecular approach to genetic and epigenetic pathogenesis of early-onset colorectal cancer.

World journal of gastrointestinal oncology

Gulcin Tezcan, Berrin Tunca, Secil Ak, Gulsah Cecener, Unal Egeli

Affiliations

  1. Gulcin Tezcan, Berrin Tunca, Secil Ak, Gulsah Cecener, Unal Egeli, Department of Medical Biology, Faculty of Medicine, Uludag University, 16059 Bursa, Turkey.

PMID: 26798439 PMCID: PMC4714149 DOI: 10.4251/wjgo.v8.i1.83

Abstract

Colorectal cancer (CRC) is the third most frequent cancer type and the incidence of this disease is increasing gradually per year in individuals younger than 50 years old. The current knowledge is that early-onset CRC (EOCRC) cases are heterogeneous population that includes both hereditary and sporadic forms of the CRC. Although EOCRC cases have some distinguishing clinical and pathological features than elder age CRC, the molecular mechanism underlying the EOCRC is poorly clarified. Given the significance of CRC in the world of medicine, the present review will focus on the recent knowledge in the molecular basis of genetic and epigenetic mechanism of the hereditary forms of EOCRC, which includes Lynch syndrome, Familial CRC type X, Familial adenomatous polyposis, MutYH-associated polyposis, Juvenile polyposis syndrome, Peutz-Jeghers Syndrome and sporadic forms of EOCRC. Recent findings about molecular genetics and epigenetic basis of EOCRC gave rise to new alternative therapy protocols. Although exact diagnosis of these cases still remains complicated, the present review paves way for better predictions and contributes to more accurate diagnostic and therapeutic strategies into clinical approach.

Keywords: Clinical outcome; Colorectal cancer; Early-onset; Epigenetic mechanism; Genetic mechanism

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