Interesting research into the mechanisms by which the immune system responds to DNA damage is reported at EurekAlert. "Our study is the first to show that there are mechanisms in place for the immune system to identify cancer cells. It reveals how natural killer [NK] cells distinguish something they're supposed to get rid of versus something they're supposed to keep. ... What's new about our study is that we found that cells with damaged DNA can also involve other cells in the fight, triggering a mechanism that signals other cells - specifically NK cells - to attack. It could be another ingenious trick that the body uses to ward off cancerous cells." Understanding existing mechanisms for removing cells with damaged DNA is a step on the path towards SENS technologies to repair the causes of aging.
Link: http://www.eurekalert.org/pub_releases/2005-07/uoc--nsf070105.php