Reference Detail

Ref Type

abstract

PMID

Authors

Mitesh J. Borad, Alison M. Schram, Richard D. Kim, Suneel Deepak Kamath, Vaibhav Sahai, Efrat Dotan, Robin Kate Kelley, Mariano Ponz-Sarvise, Do-Youn Oh, Jeffrey Yachnin, Vaia Florou, Philippe Alexandre Cassier, Joon Oh Park, Chih-Yi Liao, Michael Millward, Florence (Tianhui) Ramirez, Fabien Jean Ricard, Antoine Hollebecque, Vivek Subbiah, Lipika Goyal

Title

Updated dose escalation results for ReFocus, a first-in-human study of highly selective FGFR2 inhibitor RLY-4008 in cholangiocarcinoma and other solid tumors.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Journal of Clinical Oncology	41	16_suppl	2023

URL

https://ascopubs.org/doi/10.1200/JCO.2023.41.16_suppl.4009

Abstract Text

Background: Oncogenic FGFR2 alterations (fusions/rearrangements (f/r), amplifications, mutations) represent a broad therapeutic opportunity as they drive multiple solid tumors, particularly cholangiocarcinoma (CCA). However, off-isoform toxicity and on-target resistance limit the benefit of approved pan-FGFR inhibitors (FGFRi). RLY-4008 is the first potent, highly selective, oral FGFR2 inhibitor designed to overcome these limitations by targeting FGFR2 driver alterations and resistance mutations. Here, we present updated dose escalation results from ReFocus (NCT04526106), a seamless Phase I/II, open label study evaluating the safety and preliminary efficacy of RLY-4008 in patients (pts) with advanced, FGFR2-altered solid tumors. Methods: Adult pts received RLY-4008 BID, QD, QD discontinuous on a 4-week (wk) cycle following a Bayesian Optimal Interval design. Treatment-related adverse events (TRAEs), PK, ctDNA and anti-tumor activity (RECIST v1.1) were assessed. Results: As of 30 Jan 23, 116 pts (82 f/r, 27 mutation, 6 amplification) received RLY-4008 at doses of 20-200 mg/day, including 91 with CCA. 50% had prior FGFRi, and median lines of prior therapies was 3 (1-15). 28/46 ct-DNA-evaluable pts with CCA with prior FGFRi had ≥1 baseline resistance mutation, most commonly at FGFR2 N549X (23/46) or V564X (17/46). RLY-4008 had favorable PK with doses ≥40 mg QD providing FGFR2 occupancy ≥90%. 70 mg QD was the RP2D based on PK, safety, anti-tumor activity and exposure-dependent tumor regressions in FGFRi-naïve CCA f/r pts. Anti-tumor activity was observed in CCA and solid tumors across doses and FGFR2 alterations with radiographic tumor reductions in 74 (64%), SD/PR in 83 (72%), including 4/4 (100%) FGFRi-naïve CCA f/r pts at RP2D achieving confirmed PR. Clinically meaningful disease control and durable responses were observed in pts with FGFR2 f/r CCA. Overall, median treatment duration was 24 wks (range <1-108 wks). 105 pts discontinued (PD (81%), AE (3%), other (7%)). Across doses, most common TRAEs were low-grade PPE (57%), stomatitis (56%), dry mouth (38%), alopecia (28%), and dry eye (22%). No grade 4/5 TRAEs were observed. Conclusions: These encouraging dose escalation data confirm the broad therapeutic potential of highly selective FGFR2 targeting with RLY-4008 by demonstrating encouraging initial efficacy across FGFR2-altered solid tumors and genomic alterations, with a differentiated safety profile that avoids FGFR1- and FGFR4-related toxicity. Phase 2 of ReFocus continues across solid tumors and with registrational intent in FGFRi-naïve, FGFR2 f/r CCA. Clinical trial information: NCT04526106.

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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
FGFR2 fusion	cholangiocarcinoma	predicted - sensitive	RLY-4008	Phase Ib/II	Actionable	In a Phase I/II trial (ReFocus), RLY-4008 treatment resulted in radiographic tumor reductions in 64% (74/116) and partial responses/stable disease in 72% (83/116) of patients with advanced solid tumors harboring FGFR2 alterations, and an objective response rate of 52% (13/25) and a disease control rate of 88% (22/25) in FGFR inhibitor-naive cholangiocarcinoma patients harboring FGFR2 fusions or rearrangements (J Clin Oncol 41, 2023 (suppl 16; abstr 4009); NCT04526106).	detail...