Lelaidier C, Saint-Mleux CB, Fernandez H, Bourget P, Frydman R [Embryo expulsion induction in first trimester miscarriages. Use of mifepristone (RU 486) in a double blind prospective randomized study]. Contracept Fertil Sex. 1993 Jun;21(6):505-8. French.
Lister MS, Shaffer LE, Bell JG, Lutter KQ, Moorma KH Randomized, double-blind, placebo-controlled trial of vaginal misoprostol for management of early pregnancy failures. Am J Obstet Gynecol. 2005 Oct;193(4):1338-43.
Nielsen S, Hahlin M, Platz-Christensen JJ Unsuccessful treatment of missed abortion with a combination of an antiprogesterone and a prostaglandin E1 analogue. Br J Obstet Gynaecol. 1997 Sep;104(9):1094-6.
Schaff EA, DiCenzo R, Fielding SL Comparison of misoprostol plasma concentrations following buccal and sublingual administration. Contraception. 2005 Jan;71(1):22-5.
Trinder J, Brocklehurst P, Porter R, Read M, Vyas S, Smith L Management of miscarriage: expectant, medical, or surgical? Results of randomised controlled trial (miscarriage treatment (MIST) trial). BMJ. 2006 May 27;332(7552):1235-40. Epub 2006 May 17.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.