BURLINGAME, Calif.--(BUSINESS WIRE)--Humanigen, Inc. (NASDAQ: HGEN) (“Humanigen”), a clinical stage biopharmaceutical company focused on preventing and treating an immune hyper-response called ‘cytokine storm’ with its lead drug candidate, lenzilumab™, today announced the United States Patent and Trademark Office has issued a patent to the Company for the use of lenzilumab in prevention or treatment of cytokine storm and neurotoxicity in patients undergoing chimeric antigen receptor T (CAR-T) c