Glossary of HIV/AIDS Terms
This glossary contains 1,600 terms and is maintained by the editors of the San Francisco AIDS Foundation's Bulletin of Experimental Treatments for AIDS.
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controlled trial: a clinical trial in which a group receiving an experimental drug or other therapy (the experimental arm) is compared with a group not receiving that therapy (the control arm). In a placebo-controlled trial, the control arm receives an inactive substance or mock therapy (placebo); in an active control trial, the control group is given an existing standard therapy. Compare with uncontrolled trial.