Therapeutic Response

IDH1 p.R132S status confers therapeutic sensitivity to Ivosidenib in patients with Cholangiocarcinoma.

Statements

Source and description
Tibsovo (ivosidenib) [package insert]. FDA. The U.S. Food and Drug Administration granted approval to ivosidenib for the treatment adult patients with locally advanced or metastatic cholangiocarcinoma who have been previously treated with a susceptible IDH1 mutation, as detected by an FDA-approved test. This indication is based on Study AG120-C-005 (NCT02989857), a randomized, multicenter, double-blind, placebo-controlled clinical trial consisting of 185 adult patients with locally advanced or metastatic cholangiocarcinoma with an IDH1 mutation. The product label notes that, across both arms of the trial, patients primarily had R132 variants: R132C (70% of patients), R132L (15%), R132G (12%), R132H (1.1%), and R132S (1.6%).
Tibsovo (ivosidenib) [product monograph]. HC. Health Canada approved ivosidenib in combination with azacitidine is indicated for the treatment of adult patients with newly diagnosed acute myeloid leukemia (AML) with an isocitrate dehydrogenase-1 (IDH1) R132 mutation who are not eligible to receive intensive induction chemotherapy.