The first three patients participating in an early test of a “revolutionary” human gene therapy for erectile dysfunction have not developed any treatment-related side effects, according to preliminary results released here this week at a meeting of the International Society for Sexual and Impotence Research. Dr. Albert Melman, of the Albert Einstein College of Medicine in New York, and colleagues are testing the safety of a single penile injection of a gene called maxi-K. The trial was launched in the spring of 2004 at the Mount Sinai School of Medicine in New York.