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this cancer occurs when the infected cells keep on duplicating themselves and eventually infecting a larger area of the body. The infectious cells have the genetic makeup to keep on producing infected cells and kills off good cells.
Cancer cells keep proliferating uncontrollably without any balance between cell production and cell death. It's like an invasion that intrudes upon and destroys adjacent tissues (normal tissues such as the liver). That's how it happens.
When tissues destruction occurs the process of repair and healing requires cell replication and mitotic replication of DNA, whenever DNA replicates there is potential for mistakes to occur (mutations changing the genetic code), this can lead to the normal regulation of regulation and apoptosis (controlled cell death) to be impaired resulting in cancer. Hence how repeated/chronic damage to tissue can eventually lead to cancer