3,4-methylenedioxymethamphetamine (MDMA) is a drug that can produce effects uniquely suited to reducing anxiety for people with anxiety arising from a cancer diagnosis. MDMA has been hypothesized to belong to a class of drugs, called entactogens, that produce feelings of closeness to others, empathy, wellbeing, and insightfulness. Currently, MDMA is scheduled (illegal) and cannot be used outside of research studies like this one. However, prior to its being made illegal, some psychotherapists treated people with cancer or other terminal illnesses with MDMA-assisted psychotherapy, and they reported a reduction in anxiety and improved quality of life.