قارن الطرق

	دراسة المرحلة الرابعة متعددة المراكز	دراسة الأتراب الاستشرافية
المجال	علم الأوبئة	علم الأوبئة
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1980s–1990s (formalized with post-marketing requirements in modern drug regulation)	1950s (systematic application); conceptual roots earlier
صاحب الطريقة	Regulatory agencies and pharmaceutical industry (ICH E2E, FDA, EMA post-marketing frameworks)	Richard Doll and Austin Bradford Hill (landmark application, 1951-1954); cohort methodology formalised by modern epidemiology textbooks
النوع	Observational or interventional post-marketing study	Observational longitudinal study design
المصدر التأسيسي	Strom, B. L., & Kimmel, S. E. (Eds.). (2005). Textbook of Pharmacoepidemiology. John Wiley & Sons. ISBN: 978-0470029619	Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern Epidemiology (3rd ed.). Lippincott Williams & Wilkins. ISBN: 978-0781755641
الأسماء البديلة	multicenter post-marketing study, multicenter pharmacovigilance study, multi-site phase IV study, post-authorization safety study	longitudinal cohort study, prospective follow-up study, incidence study, prospective observational cohort
ذات صلة	6	6
الملخص	A multicenter Phase IV study is a post-marketing surveillance investigation conducted simultaneously at two or more clinical or research sites after a drug, device, or intervention has received regulatory approval. By pooling real-world data from diverse patient populations and geographic regions, it detects rare adverse events, evaluates long-term effectiveness, characterizes safety in subgroups, and fulfills regulatory post-authorization commitments that single-site studies cannot achieve.	A prospective cohort study assembles a group of participants who are free of the outcome of interest at baseline, measures their exposures, and then follows them forward in time to record who develops the outcome. By collecting exposure data before outcomes occur, it establishes a clear temporal sequence that supports causal inference — a major advantage over retrospective designs. It is the cornerstone observational method in epidemiology and clinical research.