1. 
   Agent study
   An agent study is a part of a clinical trial that tests the chemotherapeutic properties of a specific substance. More specifically, an agent study is used to detect whether or not a substance can prevent or inhibit cancer. In a clinical trial, researchers perform multiple studies in order to test t...
   Found op http://en.wikipedia.org/wiki/Agent_study
   
   
2. 
   agent study
   In cancer prevention, a clinical trial that studies whether taking certain medicines, vitamins, minerals, or food supplements can prevent cancer. Also called chemoprevention study.
   Found op http://www.cancer.gov/dictionary?expand=A
   
   

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