A new study from the Memorial Sloan-Kettering Cancer Center says a new experimental drug can help men who suffer from prostate cancer. The study, which was published in the journal Science Express, says the drug does so by lowering PSA levels, which usually signify growth of a tumor. For this study, researchers examined 30 men and exposed them to certain compounds they hoped would affect PSA levels. They found the compounds in the drug dropped PSA levels in 22 out of the 30 men.