A retinoid called all-trans retinoic acid (ATRA), which is a vitamin A-derivative, is already used successfully to treat a rare sub-type of acute myeloid leukemia (AML), however this drug has not been effective for the more common types of AMLs. Team leader Arthur Zelent, Ph.D., and colleagues at the ICR have been working to unlock the potential of retinoids to treat other patients with AML. In a paper published in Nature Medicine today, they show that the key could be an antidepressant called tranylcypromine (TCP).