A phase I, open-label, multicenter, dose-escalation study of the oral selective FGFR inhibitor debio 1347 in patients with advanced solid tumors harboring FGFR gene alterations

Martin H. Voss, Cinta Hierro, Rebecca S. Heist, James M. Cleary, Funda Meric-Bernstam, Josep Tabernero, Filip Janku, Leena Gandhi, A. John Iafrate, Darrell R. Borger, Nobuya Ishii, Youyou Hu, Yulia Kirpicheva, Valerie Nicolas-Metral, Anna Pokorska-Bocci, Anne Vaslin Chessex, Claudio Zanna, Keith T. Flaherty, Jose Baselga

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    24 Citations (Scopus)

    Abstract

    © 2019 American Association for Cancer Research. Purpose: To investigate tolerability, efficacy, and pharmacokinetics/pharmacodynamics of Debio 1347, a selective FGFR inhibitor. Patients and Methods: This was a first-in-human, multicenter, open-label study in patients with advanced solid tumors harboring FGFR1–3 gene alterations. Eligible patients received oral Debio 1347 at escalating doses once daily until disease progression or intolerable toxicity. Dose-limiting toxicities (DLT) were evaluated during the first 4 weeks on treatment, pharmacokinetics/pharmacodynamics postfirst dose and after 4 weeks. Results: A total of 71 patients were screened and 58 treated with Debio 1347 at doses from 10 to 150 mg/day. Predominant tumor types were breast and biliary duct cancer, most common gene alterations were FGFR1 amplifications (40%) and mutations in FGFR2 (12%) and FGFR3 (17%); 12 patients (21%) showed FGFR fusions. Five patients at three dose levels had six DLTs (dry mouth/eyes, hyperamylasemia, hypercalcemia, hyperbilirubinemia, hyperphosphatemia, and stomatitis). The maximum tolerated dose was not reached, but dermatologic toxicity became sometimes dose limiting beyond the DLT period at 80 mg/day. Adverse events required dose modifications in 52% of patients, mostly due to dose-dependent, asymptomatic hyperphosphatemia (22%). RECIST responses were seen across tumor types and mechanisms of FGFR activation. Six patients, 3 with FGFR fusions, demonstrated partial responses, 10 additional patients' tumor size regressions of 30%. Plasma half-life was 11.5 hours. Serum phosphate increased with Debio 1347 plasma levels and confirmed target engagement at doses 60 mg/day. Conclusions: Preliminary efficacy was encouraging and tolerability acceptable up to 80 mg/day, which is now used in an extension part of the study.
    Original languageEnglish
    Pages (from-to)2699-2707
    JournalClinical Cancer Research
    Volume25
    DOIs
    Publication statusPublished - 1 Jan 2019

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