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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.〔(glossary )〕 In a clinical trial, researchers perform multiple studies in order to test the potential of new cancer drugs. An agent study helps determine the potential of a substance to inhibit cancer, before more studies are done in order to further knowledge of this potential.
==Cytotoxic vs. Cytostatic Agents==
Agent studies are used to determine whether a substance exhibits cytotoxicity or cytostasis. A cytotoxic agent will shrink a tumor, while, a cytostatic agent slows or stops tumor growth and metastases. It is important to determine which of these effects an agent poses so that a proper clinical trial can be designed. For example, a study with a cytotoxic agent will look for tumor shrinkage vs. dose. It is much harder to develop a clinical trial for a cytostatic agent.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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