Tumor initiation

Tumor initiation is defined as "a process in which normal cells are changed so that they are able to form tumors".{{cite web|url=http://www.cancer.gov/dictionary?CdrID=390314|title=tumor initiation|publisher=National Cancer Institute|access-date=9 Nov 2012}} It is the first phase in tumor development.{{cite book | vauthors = Compton C | chapter = Cancer initiation, promotion, and progression and the acquisition of key behavioral traits. | title = Cancer: The Enemy from Within | date = 2020 | pages = 25–48 | publisher = Springer | location = Cham | doi = 10.1007/978-3-030-40651-6_2 | isbn = 978-3-030-40650-9 }} Mutagens, substances that cause cancer can be tumor initiators.