Scientists at Jefferson's Kimmel Cancer Center in Philadelphia have found that a signaling protein that is key to prostate cancer cell growth is turned on in nearly all recurrent prostate cancers that are resistant to hormone therapy.
If the findings hold up, the protein, called Stat5, may be a specific drug target against an extremely difficult-to-treat cancer.
In addition, the researchers, led by Marja Nevalainen, M.D., Ph.D., associate professor of Cancer Biology at Jefferson Medical College of Thomas Jefferson University, also showed that the convergence of two biological pathways could be responsible for making such hormone-resistant prostate cancers especially dangerous. They have found that a synergy between Stat5 and hormone receptors in recurrent prostate cancer cells helps each maintain its activity. Dr. Nevalainen and her co-workers report their findings January 1, 2008 in the journal Cancer Research.
“These findings validate Stat5 as a potential drug target in prostate cancer, and in particular, in a form of prostate cancer for which there are no effective therapies,” Dr. Nevalainen says.
Men with primary prostate cancer usually have either surgery or radiation, whereas subsequent disease is frequently treated by hormone therapy. But if the cancer recurs again, years later, it can be more aggressive and typically fails to respond to hormone treatment. In previous work, the researchers showed that when Stat5 is turned on in primary prostate cancer, men are more likely to have recurrent disease.