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Ref Type Journal Article
PMID (32312893)
Authors Cooper AJ, Kobayashi Y, Kim D, Clifford SE, Kravets S, Dahlberg SE, Chambers ES, Li J, Rangachari D, Nguyen T, Costa DB, Rabin MS, Wagle N, Sholl LM, Jänne PA, Oxnard GR
Title Identification of a RAS-activating TMEM87A-RASGRF1 Fusion in an Exceptional Responder to Sunitinib with Non-Small Cell Lung Cancer.
Journal Clinical cancer research : an official journal of the American Association for Cancer Research
Vol 26
Issue 15
Date 2020 Aug 01
URL
Abstract Text We pursued genomic analysis of an exceptional responder with non-small cell lung cancer (NSCLC) through a multi-platform effort to discover novel oncogenic targets.In this open-label, single-arm phase II study (NCT01829217), an enriched cohort of patients with advanced NSCLC was treated with the multi-kinase inhibitor sunitinib. The primary endpoint was objective response rate. Tissue was collected for multi-platform genomic analysis of responders, and a candidate oncogene was validated using in vitro models edited by CRISPR-Cas9.Of 13 patients enrolled, 1 patient (8%), a never smoker, had a partial response lasting 33 months. Genomic analysis of the responder identified no oncogenic variant using multi-platform DNA analysis including hotspot allelotyping, massively parallel hybrid-capture next-generation sequencing, and whole-exome sequencing. However, bulk RNA-sequencing (RNA-seq) revealed a novel fusion, TMEM87A-RASGRF1, with high overexpression of the fusion partners. RASGRF1 encodes a guanine exchange factor which activates RAS from GDP-RAS to GTP-RAS. Oncogenicity was demonstrated in NIH/3T3 models with intrinsic TMEM87A-RASGRF1 fusion. In addition, activation of MAPK was shown in PC9 models edited to express this fusion, although sensitivity to MAPK inhibition was seen without apparent sensitivity to sunitinib.Sunitinib exhibited limited activity in this enriched cohort of patients with advanced NSCLC. Nonetheless, we find that RNA-seq of exceptional responders represents a potentially underutilized opportunity to identify novel oncogenic targets including oncogenic activation of RASGRF1.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
RET rearrange lung adenocarcinoma no benefit Sunitinib Clinical Study - Cohort Actionable In a Phase II trial, Sutent (sunitinib) treatment demonstrated limited clinical efficacy, with no objective responses and stable disease in 71% (5/7) of lung adenocarcinoma patients harboring RET rearrangements (PMID: 32312893; NCT01829217). 32312893