Source:http://linkedlifedata.com/resource/umls/id/C0013230
MSH: Drugs which have received FDA approval for human testing but have yet to be approved for commercial marketing. This includes drugs used for treatment while they still are undergoing clinical trials (Treatment IND). The main heading includes drugs under investigation in foreign countries.,NCI: A new drug or biological drug that is used in a clinical investigation. The term also includes a biological product that is used in vitro for diagnostic purposes. (FDA; 21 CFR Ch.I, PART 312),NCI: A substance that has been tested in a laboratory and has gotten approval from the U.S. Food and Drug Administration (FDA) to be tested in people. An experimental drug may be approved by the FDA for use in one disease or condition but be considered investigational in other diseases or conditions.