Comparative Molecular Analysis of Gastrointestinal Adenocarcinomas

Publication date: Available online 2 April 2018
Source:Cancer Cell
Author(s): Yang Liu, Nilay S. Sethi, Toshinori Hinoue, Barbara G. Schneider, Andrew D. Cherniack, Francisco Sanchez-Vega, Jose A. Seoane, Farshad Farshidfar, Reanne Bowlby, Mirazul Islam, Jaegil Kim, Walid Chatila, Rehan Akbani, Rupa S. Kanchi, Charles S. Rabkin, Joseph E. Willis, Kenneth K. Wang, Shannon J. McCall, Lopa Mishra, Akinyemi I. Ojesina, Susan Bullman, Chandra Sekhar Pedamallu, Alexander J. Lazar, Ryo Sakai, Vésteinn Thorsson, Adam J. Bass, Peter W. Laird
We analyzed 921 adenocarcinomas of the esophagus, stomach, colon, and rectum to examine shared and distinguishing molecular characteristics of gastrointestinal tract adenocarcinomas (GIACs). Hypermutated tumors were distinct regardless of cancer type and comprised those enriched for insertions/deletions, representing microsatellite instability cases with epigenetic silencing of MLH1 in the context of CpG island methylator phenotype, plus tumors with elevated single-nucleotide variants associated with mutations in POLE. Tumors with chromosomal instability were diverse, with gastroesophageal adenocarcinomas harboring fragmented genomes associated with genomic doubling and distinct mutational signatures. We identified a group of tumors in the colon and rectum lacking hypermutation and aneuploidy termed genome stable and enriched in DNA hypermethylation and mutations in KRAS, SOX9, and PCBP1.

Graphical abstract

Teaser

Liu et al. analyze 921 gastrointestinal (GI) tract adenocarcinomas and find that hypermutated tumors are enriched for insertions/deletions, upper GI tumors with chromosomal instability harbor fragmented genomes, and a group of genome-stable colorectal tumors are enriched in mutations in SOX9 and PCBP1.


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