On the EXEL message board today "Pain Meds Could Be Linked to Tumor Growth" This should have been posted on the PGNX board. A link is given to two papers given by U. Chicago researches about opiod pain killers accelerating tumor growth. Relistor stops this problem. Progenics licensed Relistor from U. Chicago but not as a cancer drug. Doctors can use Relistor off label if they know about this benefit.