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PMID
Authors Ye Guo, Chunwang Yuan, Jieer Ying, Xu Zhu, Guodong Luan, Bin Zhang, Renbin Zhao, Jin Li
Title Phase I result of ICP-192 (gunagratinib), a highly selective irreversible FGFR inhibitor, in patients with advanced solid tumors harboring FGFR pathway alterations.
Journal Vol Issue Date Pages Journal Short Title
J Clin Oncol 39 suppl 15
URL https://meetings.asco.org/abstracts-presentations/198825
Abstract Text Background: ICP-192 (gunagratinib), developed by InnoCare Pharma, is a novel pan-FGFR (fibroblast growth factor receptors) inhibitor that potently and selectively inhibits FGFR activities irreversibly by covalent binding. Preclinical data showed that gunagratinib overcomes the acquired resistance to the first-generation reversible FGFR inhibitors, e.g., infigratinib. ICP-CL-00301 is a phase I, first-in-human, clinical study which includes a dose escalation followed by dose expansion. The safety and tolerability as well as pharmacokinetics/pharmacodynamics (PK/PD) of gunagratinib were evaluated in patients with advanced solid tumors, and the preliminary anti-tumor activity was evaluated by RECIST1.1 in patients with FGF/FGFR gene aberrations. Methods: In the dose-escalation stage, patients with advanced solid tumors with or without FGF/FGFR alterations were treated with escalating doses (2, 4, 8, 10, 12, 14, 16 mg etc.) of gunagratinib once daily in 21-day cycles until disease progression or unacceptable toxicity. During the dose-expansion stage, patients with cholangiocarcinoma harboring FGFR2 gene fusion/translocation received the treatment of gunagratinib daily at 12 mg continuously. Results: As of February 2021, a total of 30 patients had received the treatment of gunagratinib. The median age of the treated patients was 55.0 (range: 28 to 75 years) with 56.7% male and ECOG performance status between 0-1. The maximum tolerated dose (MTD) had not been reached. The most common treatment-related adverse events (TRAEs) ( > 20%) included hyperphosphatemia, hypercalcemia, increased ALT or AST, diarrhea and hypertriglyceridemia. Hyperphosphatemia is a commonly reported AE from other trials targeting FGFR and here serves as a PD biomarker of FGFR inhibition. This PD biomarker was observed in 73.3% of the patients treated with gunagratinib at all dose levels and was consistently observed at doses of 8 mg QD and above. Hyperphosphatemia was well managed with oral phosphate binders when necessary. The plasma exposure increased proportionally to the oral dosage levels of gunagratinib. Among the 12 patients with FGF/FGFR gene aberrations who have completed at least one tumor assessment, the overall response rate (ORR) was 33.3%, including 1 patient (8.3%) of cholangiocarcinoma with complete response (CR) and 3 patients (25%) with partial response (PR). The disease control rate (DCR) was 91.7% (11 of 12 patients). Conclusions: Gunagratinib is safe and well-tolerated in patients with advanced solid tumors. Anti-tumor activity was demonstrated in patients with FGF/FGFR gene aberrations in multiple tumor types, including cholangiocarcinoma (NCT03758664). Better response is expected with the increase of treatment durations. Clinical trial information: NCT03758664

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