Identification of Critical Radioresistance Genes in Esophageal Squamous Cell Carcinoma by Whole-exome Sequencing

Overview

Journal Ann Transl Med

Publisher AME Publishing Company

Date 2020 Sep 21

PMID 32953798

Citations 4

Authors

Zhiming Chen

Ninghua Yao

Shu Zhang

Yao Song

Qi Shao

Hongmei Gu

Jianbo Ma

Buyou Chen

Hongyu Zhao

Ye Tian

Affiliations

Soon will be listed here.

Abstract

Background: Esophageal squamous cell carcinoma (ESCC) is one of the most lethal cancer due to insufficient actionable molecules. Radiotherapy (RT) plays a vital role in the treatment of ESCC, while radioresistance is a significant challenge to RT and results in locoregional and distant failure.

Methods: Radioresistance is a complex involving confounding factors, and its genetic mechanism is challenging to study. Postoperative recurrence after RT is more likely to be due to genetic causes than recurrence in unoperated patients. Therefore, two independent cohorts of ESCC patients who had received postoperative radiotherapy (PORT) and had opposite prognoses were set up, and whole-exome sequencing (WES) technology was applied. We compared the differences in the mutant spectra between the two groups.

Results: The mutation rate was slightly higher in the relapsed group than in the stable group [average mutation rate, 1.15 0.73 mutations per megabyte (Mb)], while the mutation types and proportions in the two groups were not significantly different. In particular, three mutated genes (TTN, MUC19, and NPIPA5) and two copy number alterations (CNAs) (1q amplification and 14q deletion) were identified to be associated with poor RT prognosis, while MUC4 was a favorable factor.

Conclusions: These radioresistance biomarkers may supply insight into predicting the radioresponse. Further, these findings offer the first data on the mutational landscape of ESCC radioresistance.

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