Acquired On-Target Clinical Resistance Validates FGFR4 as a Driver of Hepatocellular Carcinoma.

Abstract:

:Hepatocellular carcinoma (HCC) is a leading cause of cancer mortality worldwide with no clinically confirmed oncogenic driver. Although preclinical studies implicate the FGF19 receptor FGFR4 in hepatocarcinogenesis, the dependence of human cancer on FGFR4 has not been demonstrated. Fisogatinib (BLU-554) is a potent and selective inhibitor of FGFR4 and demonstrates clinical benefit and tumor regression in patients with HCC with aberrant FGF19 expression. Mutations were identified in the gatekeeper and hinge-1 residues in the kinase domain of FGFR4 upon disease progression in 2 patients treated with fisogatinib, which were confirmed to mediate resistance in vitro and in vivo. A gatekeeper-agnostic, pan-FGFR inhibitor decreased HCC xenograft growth in the presence of these mutations, demonstrating continued FGF19-FGFR4 pathway dependence. These results validate FGFR4 as an oncogenic driver and warrant further therapeutic targeting of this kinase in the clinic. SIGNIFICANCE: Our study is the first to demonstrate on-target FGFR4 kinase domain mutations as a mechanism of acquired clinical resistance to targeted therapy. This further establishes FGF19-FGFR4 pathway activation as an oncogenic driver. These findings support further investigation of fisogatinib in HCC and inform the profile of potential next-generation inhibitors.See related commentary by Subbiah and Pal, p. 1646.This article is highlighted in the In This Issue feature, p. 1631.

journal_name

Cancer Discov

journal_title

Cancer discovery

authors

Hatlen MA,Schmidt-Kittler O,Sherwin CA,Rozsahegyi E,Rubin N,Sheets MP,Kim JL,Miduturu C,Bifulco N,Brooijmans N,Shi H,Guzi T,Boral A,Lengauer C,Dorsch M,Kim RD,Kang YK,Wolf BB,Hoeflich KP

doi

10.1158/2159-8290.CD-19-0367

subject

Has Abstract

pub_date

2019-12-01 00:00:00

pages

1686-1695

issue

12

eissn

2159-8274

issn

2159-8290

pii

2159-8290.CD-19-0367

journal_volume

9

pub_type

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