Rexahn Pharmaceuticals, Inc. (NYSE American: RNN), a clinical-stage biopharmaceutical company developing innovative therapies to improve patient outcomes in cancers that are difficult to treat, announced that the U.S. Patent and Trademark Office has issued a Notice of Allowance for U.S. Patent Application No. 15/683,408, “Fluorocyclopentenylcytosine Methods of Use.” The patent application covers the use of RX-3117 in a broad range of tumor types that over-express UCK2, the enzyme that activates RX-3117. The company expects the patent to be issued within a few months from the notice of allowance and provide protection to 2036.