medical treatment, namely, administering gene therapies in the nature of in vivo and ex vivo vector treatments; medical treatment, namely, administering gene therapies in the nature of lentiviral vector therapies; medical treatment, namely, administering gene therapies in the nature of gene therapies for the treatment of rare diseases; medical treatment, namely, administering gene therapies in the nature of gene therapies for Hereditary Tyrosinemia Type 1; medical treatment, namely, administering gene therapies in the nature of gene therapies for orphan disease; medical treatment, namely, administering gene therapies in the nature of gene therapies for inborn errors of hepatic metabolism