Reference Detail

Ref Type

Abstract

PMID

Authors

Robin Lewis Jones, Teresa Macarulla, John A. Charlson, Brian Andrew Van Tine, Lipika Goyal, Antoine Italiano, Christophe Massard, Mark Rosenthal, Macarena Ines De La Fuente, Patricia Roxburgh, Madappa N. Kundranda, Jean-Yves Blay, Changhoon Yoo, Kate Lipford, Sanjeev Forsyth, Sylvie Mireille Guichard, Yelena Mikhailov, Blythe Thomson, Patrick Francis Kelly, Florence Duffaud

Title

A phase Ib/II study of olutasidenib in patients with relapsed/refractory IDH1 mutant solid tumors: Safety and efficacy as single agent.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Journal of Clinical Oncology	38	no. 15_suppl	May 25, 2020

URL

https://ascopubs.org/doi/abs/10.1200/JCO.2020.38.15_suppl.e16643

Abstract Text

Background: Isocitrate dehydrogenase 1 mutations (mIDH1) are present in a variety of solid tumors resulting in production and accumulation of (R)-2-hydroxyglutarate causing DNA hypermethylation and promoting tumorigenesis. Olutasidenib is an oral, potent and selective inhibitor of mutated IDH1 protein. We report preliminary results from the ongoing, first-in-human, Phase 1, open-label, single-arm study of olutasidenib in non-CNS solid tumors. Methods: Patients with advanced relapsed/refractory (R/R) mIDH1 solid tumors received olutasidenib 150 mg BID, orally. Following a dose confirmation cohort (Phase 1b), patients with intrahepatic cholangiocarcinoma (IHCC), chondrosarcoma (CS), or unspecified mIDH1 solid tumors (Other) were enrolled in a Phase 2 efficacy evaluation (NCT: 03684811). Results: As of 31-Oct-2019, 44 patients with relapsed or refractory mIDH1 solid tumors were treated with olutasidenib. Diagnosis included: IHCC (n = 26), CS (n = 13), and Other (n = 5). The median age was 58 years (range: 29-81) and 43% were male. Median number of prior treatments was 2 (1-10). mIDH1 status was locally determined (IHC, NGS or PCR): R132C (61%), R132G (7%), R132S (7%), R132H (2%), R132L (2%), Others (2%) & unspecified (18%). Fourteen patients discontinued treatment (disease progression [n = 6; 3 IHCC, 2 CS, 1 Other], AE [n = 4; 3 IHCC, 1 CS], PI decision [n = 3; IHCC] & withdraw consent [n = 1; IHCC]). Treatment emergent adverse events (all grades, regardless of attribution) that occurred in > 15% of pts were: nausea (43%), fatigue (25%), decreased appetite (22%), AST increase (18%), ALT increase (16%), and constipation (16%). No protocol-defined DLTs occurred. Best responses by tumor type are shown in the table. Conclusions: Single agent olutasidenib at 150 mg BID demonstrates acceptable safety and tolerability with preliminary clinical activity in patients with R/R mIDH1 solid tumors. Updated safety and clinical activity, as well as exploratory evaluations of PK/PD will be provided.

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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
IDH1 act mut	chondrosarcoma	predicted - sensitive	Olutasidenib	Phase Ib/II	Actionable	In a Phase I/II trial, Rezlidhia (olutasidenib) treatment demonstrated acceptable safety and preliminary clinical activity in patients with IDH1-mutant intrahepatic cholangiocarcinoma, and led to stable disease in 31% (4/13) of evaluable patients (J Clin Oncol 38, no. 5_suppl (May 28, 2020); NCT03684811).	detail...
IDH1 act mut	intrahepatic cholangiocarcinoma	predicted - sensitive	Olutasidenib	Phase Ib/II	Actionable	In a Phase I/II trial, Rezlidhia (olutasidenib) treatment demonstrated acceptable safety and preliminary clinical activity in patients with IDH1-mutant intrahepatic cholangiocarcinoma, and led to stable disease in 23% (6/23) of the evaluable patients (J Clin Oncol 38, no. 5_suppl (May 28, 2020); NCT03684811).	detail...