In what ways are cancer cells different from other cells?

Destabilized: By the time it's part of an invasive cancer, the genome of a clone of cancer cell has taken enough mutations that it's remembered how to do things that adult cells shouldn't do (invade, spread, recruit other cells to help with the mischief.) eventually, the genome loses the ability to prevent more mutations from accumulating rapidly. Natural selection as in nature, but in the body.