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Tumor initiation
Pronunciation
Definition 1
A process in which normal cells are changed so that they are able to form tumors. Substances that cause cancer can be tumor initiators. (NCI Dictionary)
Definition 2
The first stage of tumor induction by a carcinogen, consisting of subtle alteration of cells by exposure to a carcinogenic agent so that they are likely to form a tumor upon subsequent exposure to a promoting agent. (NCI Thesaurus)
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