MAPS is conducting a study on LSD-assisted psychotherapy in the treatment of anxiety secondary to life-threatening illness. The study is taking place in Solothurn, Switzerland, and is the first study in 35 years to investigate the therapeutic use of LSD in human subjects. The study's primary focus is to assess the safety and effectiveness of conducting LSD-assisted psychotherapy with a population of individuals who are experiencing anxiety associated with life-threatening illness. The study has received approval from the BAG (the equivalent of the DEA in Switzerland), the Ethics Committee (the Swiss IRB), and SwissMedic. Enrolment began in April 2008 and is now complete.