Clinicopathological and molecular characteristics of RSPO fusion-positive colorectal cancer

Hashimoto, Taiki, Takayanagi, Daisuke, Yonemaru, Junpei, Naka, Tomoaki, Nagashima, Kengo, Yatabe, Yasushi, Shida, Dai, Hamamoto, Ryuji, Kleeman, Sam O, Leedham, Simon J, Maughan, Timothy, Takashima, Atsuo, Shiraishi, Kouya, Sekine, Shigeki (October 2022) Clinicopathological and molecular characteristics of RSPO fusion-positive colorectal cancer. British Journal of Cancer, 127 (6). pp. 1043-1050. ISSN 0007-0920

Abstract

Background: RSPO fusions that lead to WNT pathway activation are potential therapeutic targets in colorectal cancer (CRC), but their clinicopathological significance remains unclear. Methods: We screened 1019 CRCs for RSPO fusions using multiplex reverse transcription-PCR. The RSPO fusion-positive tumours were subjected to whole-exome sequencing (WES). Results: Our analysis identified 29 CRCs with RSPO fusions (2.8%), consisting of five with an EIF3E-RSPO2 fusion and 24 with PTPRK-RSPO3 fusions. The patients were 17 women and 12 men. Thirteen tumours (45%) were right-sided. Histologically, approximately half of the tumours (13/29, 45%) had a focal or extensive mucinous component that was significantly more frequent than the RSPO fusion-negative tumours (13%; P = 8.1 × 10-7). Four tumours (14%) were mismatch repair-deficient. WES identified KRAS, BRAF, and NRAS mutations in a total of 27 tumours (93%). In contrast, pathogenic mutations in major WNT pathway genes, such as APC, CTNNB1 and RNF43, were absent. RSPO fusion status did not have a statistically significant influence on the overall or recurrence-free survival. These clinicopathological and genetic features were also confirmed in a pooled analysis of previous studies. Conclusion: RSPO fusion-positive CRCs constitute a rare subgroup of CRCs with several characteristic clinicopathological and genetic features.

Item Type: Paper
Subjects: bioinformatics
diseases & disorders > cancer
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification
diseases & disorders
bioinformatics > genomics and proteomics > genetics & nucleic acid processing
bioinformatics > genomics and proteomics
diseases & disorders > neoplasms
diseases & disorders > cancer > cancer types > colon cancer
diseases & disorders > cancer > cancer types > colon cancer
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > mutations
diseases & disorders > cancer > cancer types
CSHL Authors:
Communities: CSHL labs > Janowitz lab
School of Biological Sciences > Publications
SWORD Depositor: CSHL Elements
Depositing User: CSHL Elements
Date: October 2022
Date Deposited: 24 Jun 2022 15:26
Last Modified: 29 Feb 2024 17:09
PMCID: PMC9470590
URI: https://repository.cshl.edu/id/eprint/40662

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