has process quality clinical trial early phase 1 Early Phase 1 clinical trial Phase 0 trial https://en.wikipedia.org/wiki/Clinical_trial http://purl.obolibrary.org/obo/NCIT_C54721 Phase 0 clinical trial A clinical trial that is at Early Phase 1 or Phase 0 Exploratory trials, involving very limited human exposure, with no therapeutic or diagnostic intent (e.g., screening studies, microdose studies). (Formerly listed as "Phase 0") Pre-Clinical Trial Leon Li, Asiyah Lin, Oliver He A clinical trial that is at an Early Phase i or Phase 0, which is designed to use an investigational agent that is available only in very limited quantities and which has never previously given to humans or for which there is extremely limited human experience. Phase 0 clinical trials are intended to enable researchers to understand the path of the drug in the body and its efficacy. Adverse event reporting in Phase 0 trials is expedited. [def-source: NCI] clinical trial