clinical trial phase clinical trial phase 3 https://en.wikipedia.org/wiki/Clinical_trial Leon Li, Asiyah Lin, Oliver He http://purl.obolibrary.org/obo/NCIT_C15602 A clinical trial phase that is designed to investigate the efficacy of the biomedical or behavioral intervention in large groups of human subjects (from several hundred to several thousand), to confirm efficacy, to monitor adverse reactions to the new medication or treatment regimen with respect to long-term use and by comparing the intervention to other standard or experimental interventions as well as to a placebo. [def-source: NCI] C15602 C0282461 Phase III