National Cancer Institute
U.S. National Institutes of Health | www.cancer.gov
In English | En español
NCI Home
Cancer Topics
Clinical Trials
Cancer Statistics
Research & Funding
News
About NCI
Dictionary of Cancer Terms
In English   En español
Page Options
Print This Page
More NCI Dictionaries
NCI Drug Dictionary

Glossary of Statistical Terms

NCI Dictionary of Genetics Terms

Terminology Resources
Quit Smoking Today
Search for
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
In English   En español

phase III trial

 A study to compare the results of people taking a new treatment with the results of people taking the standard treatment (for example, which group has better survival rates or fewer side effects). In most cases, studies move into phase III only after a treatment seems to work in phases I and II. Phase III trials may include hundreds of people.



Previous Definitions:phase I trial, phase I/II trial, phase II detoxification, phase II trial, phase II/III trial
Next Definitions:phase IV trial, phenethyl isothiocyanate, phenobarbital, phenol, phenothiazine

A Service of the National Cancer Institute
Department of Health and Human Services National Institutes of Health USA.gov