A Rockville gene therapy company is determined to find a cure for HIV — and recent studies suggest it might be on the right track. American Gene Technologies, a 15-year-old company founded and run by CEO Jeff Galvin, conducted several clinical trials with “strong, positive results” indicating a potential cure for patients diagnosed with human immunodeficiency virus (HIV), which leads to AIDS. American Gene is now creating a separate company called Addimmune to focus solely on HIV research and...