Help about Gene- and cell-based therapies for cardiovascular diseases

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Hi, I want to get some information about Gene- and cell-based therapies for cardiovascular diseases. I want to help my friend because he do not want surgery on his heart due to risk concerns. My questions are: 1. Does Gene- and cell-based therapies for cardiovascular diseases really exists? 2. If this technology is mature and practical, can you tell me which country and which hospital is most suitable for this kind of medical treatment? You can tell me the information or you can give me some internet links which are relevant in this regard. I really appreciate your help. Thank you very much.