Chronic Hepatitis B — The Effect of Entecavir Consolidation on Post-TDF Treatment Durability
Citation(s)
Jeng WJ, Chen YC, Sheen IS, Lin CL, Hu TH, Chien RN, Liaw YF Clinical Relapse After Cessation of Tenofovir Therapy in Hepatitis B e Antigen-Negative Patients. Clin Gastroenterol Hepatol. 2016 Dec;14(12):1813-1820.e1. doi: 10.1016/j.cgh.2016.07.002. Epub 2016 Jul 9.
Jeng WJ, Sheen IS, Chen YC, Hsu CW, Chien RN, Chu CM, Liaw YF Off-therapy durability of response to entecavir therapy in hepatitis B e antigen-negative chronic hepatitis B patients. Hepatology. 2013 Dec;58(6):1888-96. doi: 10.1002/hep.26549. Epub 2013 Oct 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.
