Freedman BI, Soucie JM, Stone SM, Pegram S Familial clustering of end-stage renal disease in blacks with HIV-associated nephropathy. Am J Kidney Dis. 1999 Aug;34(2):254-8.
Ramerstorfer J, Furtmüller R, Vogel E, Huck S, Sieghart W The point mutation gamma 2F77I changes the potency and efficacy of benzodiazepine site ligands in different GABAA receptor subtypes. Eur J Pharmacol. 2010 Jun 25;636(1-3):18-27. doi: 10.1016/j.ejphar.2010.03.015. Epub 2010 Mar 19.
Yu H, Anderson PJ, Freedman BI, Rich SS, Bowden DW Genomic structure of the human plasma prekallikrein gene, identification of allelic variants, and analysis in end-stage renal disease. Genomics. 2000 Oct 15;69(2):225-34.
Yu H, Bowden DW, Spray BJ, Rich SS, Freedman BI Identification of human plasma kallikrein gene polymorphisms and evaluation of their role in end-stage renal disease. Hypertension. 1998 Apr;31(4):906-11.
Yu H, Freedman BI, Rich SS, Bowden DW Human Na+/H+ exchanger genes : identification of polymorphisms by radiation hybrid mapping and analysis of linkage in end-stage renal disease. Hypertension. 2000 Jan;35(1 Pt 1):135-43.
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.