The Food and Drug Administration announced the approval of arsenic trioxide injection (Trisenox) in combination with tretinoin for the treatment of adults with newly diagnosed, low-risk acute promyelocytic leukemia (APL) characterized by t(15;17) translocation or PML/RAR-alpha gene expression.
The expanded indication was granted by the FDA on Jan. 12 after priority review. It is based on published studies and a review of Teva’s global safety database for arsenic trioxide.
A recent randomized, phase 3 trial compared tretinoin plus arsenic trioxide with tretinoin plus chemotherapy as first-line treatment for APL (J Clin Oncol. 2017 Feb 20;35[6]:605-12). It found that 100% of 127 patients in the tretinoin plus arsenic trioxide arm achieved complete remission, compared with 97% of 136 patients in the tretinoin plus chemotherapy arm. After a median follow-up of 40.6 months, the event-free survival at 50 months for patients in the tretinoin/arsenic trioxide arm was 97.3% vs. 80% for tretinoin/chemotherapy (P = .001).
The arsenic trioxide injection carries a boxed warning for differentiation syndrome and cardiac conduction abnormalities.