While most cancer cells multiply quickly, some do not, and it’s those “slow proliferators” that may play a key role in a cancer becoming resistant to certain drugs which are designed to kill the fast-growing type. Now, researchers have identified the cause of slowly-dividing cancer cells, paving to way for research into new therapies to target them. Sridhar Ramaswamy, associate professor of medicine at Massachusetts General Hospital Cancer Center, led the study.