
FGFR2 is recurrently amplified in 5% of gastric cancers and 1%–4% of breast cancers; however, this molecular alteration has never been reported in a primary colorectal cancer specimen. Preclinical studies indicate that several FGFR tyrosine-kinase inhibitors (TKIs), such as AZD4547, have in vitro activity against the FGFR2-amplified colorectal cell line, NCI-H716. The efficacy of these inhibitors is currently under investigation in clinical trials for breast and gastric cancer. Thus, better characterizing colorectal tumors for FGFR2 amplification could identify a subset of patients who may benefit from FGFR TKI therapies. Here, we describe a novel FGFR2 amplification identified by clinical next-generation sequencing in a primary colorectal cancer. Further characterization of the tumor by immunohistochemistry showed neuroendocrine differentiation, similar to the reported properties of the NCI-H716 cell line. These findings demonstrate that the spectrum of potentially clinically actionable mutations detected by targeted clinical sequencing panels is not limited to only single-nucleotide polymorphisms and insertions/deletions but also to copy-number alterations.
DNA Copy Number Variations, Gene Amplification, High-Throughput Nucleotide Sequencing, Adenocarcinoma, Middle Aged, Adenomatous Polyposis Coli, Stomach Neoplasms, Cell Line, Tumor, Humans, Female, Receptor, Fibroblast Growth Factor, Type 2, Colorectal Neoplasms, Research Article
DNA Copy Number Variations, Gene Amplification, High-Throughput Nucleotide Sequencing, Adenocarcinoma, Middle Aged, Adenomatous Polyposis Coli, Stomach Neoplasms, Cell Line, Tumor, Humans, Female, Receptor, Fibroblast Growth Factor, Type 2, Colorectal Neoplasms, Research Article
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