Which kind of therapy was given in 1990 to a four-year-old girl with adenosine deaminase (ADA) deficiency?

The first clinical gene therapy was performed in 1990, when a four-year-old girl named Ashanthi DeSilva received a
Treatment for a rare genetic disorder called severe combined immunodeficiency (SCID). The disorder is caused by a deficiency in an enzyme called adenosine deaminase (ADA), which is critical for the development and function of T and B cells in the immune system.
(2), (3) and (4) Chemotherapy, immunotherapy and radiation therapy are the types of treatment for cancer.