| 词条 | Agent study |
| 释义 |
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.[1] 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 AgentsAgent 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.[2] Phase I Clinical TrialsPhase I trials are used to determine the maximum tolerated dose of an agent. This dose is then used in the Phase II trials. Maximum tolerated dose is based on the measured toxicity in cytotoxic agents. Cytostatic agents have been demonstrated to show biologic effects while also being nontoxic. It is recommended that cytostatic agent trials determine toxicity as well as evaluation of a biologic end point in response to different doses.[2] Synonym: Chemoprevention study References1. ^glossary {{webarchive |url=https://web.archive.org/web/20070718061451/http://www.stjude.org/glossary |date=July 18, 2007 }} 2. ^1 {{cite journal | title = Clinical Trial Designs for Cytostatic Agents: Are New Approaches Needed? | journal = Journal of Clinical Oncology | date = 2001-01-01 | first = Edward L. | last = Korn |author2=Susand G. Arbuck|author3=James M. Pluda|author4=Richard Simon|author5=Richard S. Kaplan|author6=Michaela C. Christian | volume = 19 | issue = 1 | pages = 265–272| pmid = 11134222| url = http://jco.ascopubs.org/content/19/1/265.full | accessdate = 2013-11-25 | doi=10.1200/jco.2001.19.1.265}} See also
1 : Cancer research |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。