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FGFR3 mRNA overexpression defines a subset of oligometastatic colorectal cancers with worse prognosis. | LitMetric

AI Article Synopsis

  • Metastatic colorectal cancer is a major cause of cancer deaths, particularly in patients with oligometastatic liver disease, where effective biomarkers for treatment have been lacking.
  • The study examined FGFR gene alterations in 140 primary colorectal tumors and 63 liver metastases from 55 patients, finding specific overexpressions linked to poorer outcomes.
  • FGFR3 overexpression was associated with significantly shorter overall survival in liver metastases, suggesting it as a viable target for future therapies in this patient subgroup.

Article Abstract

Objectives: Metastatic colorectal cancer (CRC) remains a leading cause of cancer related deaths. Patients with oligometastatic liver disease represent a clinical subgroup with heterogeneous course. Until now, biomarkers to characterize outcome and therapeutic options have not been fully established.

Methods: We investigated the prevalence of FGFR alterations in a total of 140 primary colorectal tumors and 63 liver metastases of 55 oligometastatic CRC patients. FGF receptors () and their ligands ( and ) were analyzed for gene amplifications and rearrangements as well as for RNA overexpression . Results were correlated with clinico-pathologic data and molecular subtypes.

Results: Primary tumors showed (6.3%) and (2.2%) amplifications as well as FGFR1 (10.1%), FGFR2 (5.5%) and FGFR3 (16.2%) overexpression. In metastases, we observed amplifications (4.8%) as well as FGFR1 (8.5%) and FGFR3 (14.9%) overexpression. Neither amplifications nor gene rearrangements were observed. FGFR3 overexpression was significantly associated with shorter overall survival in metastases (mOS 19.9 vs. 47.4 months, HR=3.14, p=0.0152), but not in primary CRC (HR=1.01, p=0.985). Although rare, also amplification was indicative of worse outcome (mOS 12.6 vs. 47.4 months, HR=8.83, p=0.00111).

Conclusions: We provide the so far most comprehensive analysis of FGFR alterations in primary and metastatic CRC. We describe FGFR3 overexpression in 15% of CRC patients with oligometastatic liver disease as a prognosticator for poor outcome. Recently FGFR3 overexpression has been shown to be a potential therapeutic target. Therefore, we suggest focusing on this subgroup in upcoming clinical trials with FGFR-targeted therapies.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6114946PMC
http://dx.doi.org/10.18632/oncotarget.25941DOI Listing

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