On June 11, 2025, the FDA approved Ibtrozi® (taletrectinib) for the treatment of adults with locally advanced or metastatic ROS1-positive non-small cell lung cancer (NSCLC). Fusion errors in the ROS1 gene, which occur in approximately 1-2% of patients with lung cancer, can be determined by blood or tissue testing. If a fusion error of the ROS1 gene is present, an individual is identified as ROS1-positive. Utilizing genetic biomarkers, or specific sequences in an individual’s DNA, can be used in certain types of cancer treatments to determine the best course of therapy.
The efficacy of Ibtrozi® was tested in 270 patients in two single-arm, open-label clinical trials, meaning all participants enrolled in the clinical trials received therapy with Ibtrozi®. Efficacy was evaluated by the overall patient response rate, which varied from 52% to 90% depending on an individual’s previous treatment history, and duration of response, with most participants having a response of 6 months or more. The recommended dose of Ibtrozi® is 600mg taken by mouth once a day on an empty stomach. Warnings and precautions for Ibtrozi® include liver toxicity, inflammation of the lungs, irregular heartbeat (QTc prolongation), high uric acid levels, muscle pain with elevated blood levels of creatine phosphokinase (CPK), bone fractures and risk of fetal harm. In addition, common side effects may include diarrhea, nausea, vomiting, dizziness, rash, constipation and fatigue. Ibtrozi® (taletrectinib) was granted priority review by the FDA, which is a process to expedite the review of drugs that treat rare cancers or other rare medical conditions for which the drug may offer a treatment advantage over existing therapies, as well as an orphan drug designation.