Rexahn Pharmaceuticals, Inc. a clinical stage biopharmaceutical company developing potential best-in-class oncology therapies, recently announced that it has been issued United States Patent, No. 8,598,173, which covers a method for treating solid cancer tumors including ovarian, breast, prostate, liver, lung, kidney, colon, pancreatic and stomach for its clinical development candidate Supinoxin (RX-5902)