Abstract
74 Background: c-MET gene amplified ( MET-amp) tumors have been identified as a rare but targetable subset of esophagogastric cancer (EGC). In a phase I study, patients with MET-amp EGC had a 50% response rate to the oral MET inhibitor AMG 337, with some responses exceeding a year (Kwak EL, GI ASCO 2015). We evaluate clinical characteristics and outcomes were evaluated in patients with MET amplified esophagogastric cancer to facilitate identification of patients and establishment of treatment paradigms. Methods: Patients with metastatic MET amplified EGC were identified. MET-amplification was identified by fluorescent in situ hybridization (FISH) on paraffin-embedded tissue, with a gene to control ratio of > 2.2 defined as positive. Clinical characteristics, treatment factors, and survival were recorded. A group of metastatic non- MET amplified patients identified during the same time period who had undergone tumor genotyping and treatment at our institution was evaluated as a comparison group. Results: 21 patients were identified with metastatic MET amplified EGC and 65 patients with metastatic non- MET amplified EGC. The majority of MET amplified tumors occurred in the distal esophagus. 4 patients had co-amplification of HER2, 1 patient had PIK3CA mutation and 1 patient had a TP53 mutation. Compared to non- MET amplified tumors, MET-amplified tumors were more likely to have poorly differentiated tumors. There was no difference in initial sites of metastatic disease. Progression-free survival (PFS) for first line therapy was substantially shorter for patients with MET (6.5 mo vs 14.3 mo, p = 0.0033). MET amplified patients trended towards a shorter overall survival (OS) as well (12.3 mo vs. 20.1 mo, p = 0.0523). Conclusions: MET amplified EGC represents a distinct clinical entity characterized by rapid progression and short survival. Given the efficacy seen with MET inhibition, patients need to be tested and identified early and directed to appropriate MET-targeted clinical trials.
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