The enzyme telomerase adds DNA to the ends of chromosomes.Why would cancer cells express high levels of telomerase?

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Telomeres protect the ends of chromosomes and shorten with each cell division. Eventually, when telomeres become too short, the cell can no longer divide and undergoes senescence or apoptosis. However, cancer cells express high levels of telomerase, which adds DNA to the ends of chromosomes, thereby maintaining telomere length and enabling the cells to divide indefinitely. Thus, cancer cells need high levels of telomerase to bypass the normal limit on cell division imposed by telomere shortening.

The Enzyme Telomerase Adds DNA to the Ends of Chromosomes