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An important hallmark of cancer is aberrant growth control. Genetic changes that confer a growth advantage to the tumor cell are observed on numerous levels. Some of the best understood are mutations in proto-oncogenes and tumor suppressor genes that are linked to signal transduction pathways, cell cycle control, or cell-cell/cell-matrix interactions that regulate growth, movement, differentiation, survival, apoptosis, and genetic stability (Hartwell 1992; Weinberg 1992; Hunter 1993; Runger et al. 1994; Workman 1994). However, in addition to aberrant growth control, many cancer cells possess another important feature which distinguishes them from normal somatic cells: unlimited replicative capacity.
Harley et al. (Sat,) studied this question.