Anding K, Gross P, Rost JM, Allgaier D, Jacobs E The influence of uraemia and haemodialysis on neutrophil phagocytosis and antimicrobial killing. Nephrol Dial Transplant. 2003 Oct;18(10):2067-73.
Cohen G, Hörl WH Immune dysfunction in uremia—an update. Toxins (Basel). 2012 Oct 24;4(11):962-90. doi: 10.3390/toxins4110962. Review.
Collins AJ, Foley RN, Gilbertson DT, Chen SC The state of chronic kidney disease, ESRD, and morbidity and mortality in the first year of dialysis. Clin J Am Soc Nephrol. 2009 Dec;4 Suppl 1:S5-11. doi: 10.2215/CJN.05980809. Review.
Moro-García MA, Alonso-Arias R, López-Larrea C When Aging Reaches CD4+ T-Cells: Phenotypic and Functional Changes. Front Immunol. 2013 May 10;4:107. doi: 10.3389/fimmu.2013.00107. eCollection 2013.
Young B, Zhao X, Cook AR, Parry CM, Wilder-Smith A, I-Cheng MC Do antibody responses to the influenza vaccine persist year-round in the elderly? A systematic review and meta-analysis. Vaccine. 2017 Jan 5;35(2):212-221. doi: 10.1016/j.vaccine.2016.11.013.
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.