Therapeutic Response Statement (Sensitivity)
This therapeutic response statement supports the relationship that IDH1 p.R132L status confers therapeutic sensitivity to Ivosidenib in patients with Cholangiocarcinoma.
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%).
This statement is based on a regulatory approval from the Food and Drug Administration:
TIBSOVO is an isocitrate dehydrogenase-1 (IDH1) inhibitor indicated for patients with a susceptible IDH1 mutation as detected by an FDA-approved test with for the treatment of adult patients with locally advanced or metastatic cholangiocarcinoma who have been previously treated.