Tumor initiation

Tumor initiation is defined as 'a process in which normal cells are changed so that they are able to form tumors'. It is the first phase in tumor development. Mutagens, substances that cause cancer can be tumor initiators. Tumor initiation is defined as 'a process in which normal cells are changed so that they are able to form tumors'. It is the first phase in tumor development. Mutagens, substances that cause cancer can be tumor initiators.  This article incorporates public domain material from the U.S. National Cancer Institute document 'Dictionary of Cancer Terms'.