The gene therapy market is rapidly expanding, with over 180 companies developing more than 200 gene therapies. Key players include Ultragenyx Pharmaceutical Inc, Rocket Pharmaceuticals, and Adverum Biotechnologies. Prominent therapies in the pipeline include DTX401, RP-L102, and ADVM-022. Gene therapy aims to treat diseases by modifying genes, offering potential long-lasting effects with fewer side effects. Challenges include immune reactions, long-term effects, and high costs.