Cancer: The Enemy from Within

Tumor promotion

Tumor promotion is a process in carcinogenesis by which various factors permit the descendants of a single initiated cell to survive and expand in number, i.e.

Tumor initiation

Tumor initiation is defined as "a process in which normal cells are changed so that they are able to form tumors".

Tumor progression

Tumor progression is the third and last phase in tumor development. This phase is characterised by increased growth speed and invasiveness of the tumor cells.