PMID- 15687233 OWN - NLM STAT- MEDLINE DCOM- 20050712 LR - 20210206 IS - 0006-4971 (Print) IS - 0006-4971 (Linking) VI - 105 IP - 11 DP - 2005 Jun 1 TI - Failure of SCID-X1 gene therapy in older patients. PG - 4255-7 AB - Gene therapy has been shown to be a highly effective treatment for infants with typical X-linked severe combined immunodeficiency (SCID-X1, gammac-deficiency). For patients in whom previous allogeneic transplantation has failed, and others with attenuated disease who may present later in life, the optimal treatment strategy in the absence of human leukocyte antigen (HLA)-matched donors is unclear. Here we report the failure of gene therapy in 2 such patients, despite effective gene transfer to bone marrow CD34(+) cells, suggesting that there are intrinsic host-dependent restrictions to efficacy. In particular, there is likely to be a limitation to initiation of normal thymopoiesis, and we therefore suggest that intervention for these patients should be considered as early as possible. FAU - Thrasher, Adrian J AU - Thrasher AJ AD - Molecular Immunology Unit, Institute of Child Health, London, United Kingdom. FAU - Hacein-Bey-Abina, Salima AU - Hacein-Bey-Abina S FAU - Gaspar, H Bobby AU - Gaspar HB FAU - Blanche, Stephane AU - Blanche S FAU - Davies, E Graham AU - Davies EG FAU - Parsley, Kathryn AU - Parsley K FAU - Gilmour, Kimberly AU - Gilmour K FAU - King, Douglas AU - King D FAU - Howe, Steven AU - Howe S FAU - Sinclair, Joanna AU - Sinclair J FAU - Hue, Christophe AU - Hue C FAU - Carlier, Frederique AU - Carlier F FAU - von Kalle, Christof AU - von Kalle C FAU - de Saint Basile, Genevieve AU - de Saint Basile G FAU - le Deist, Francoise AU - le Deist F FAU - Fischer, Alain AU - Fischer A FAU - Cavazzana-Calvo, Marina AU - Cavazzana-Calvo M LA - eng GR - Wellcome Trust/United Kingdom PT - Case Reports PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20050201 PL - United States TA - Blood JT - Blood JID - 7603509 RN - 0 (Antigens, CD34) SB - IM MH - Adult MH - Antigens, CD34 MH - Bone Marrow Cells/metabolism MH - Bone Marrow Transplantation MH - Genetic Diseases, X-Linked/*therapy MH - *Genetic Therapy MH - Humans MH - Male MH - Severe Combined Immunodeficiency/*therapy MH - Transduction, Genetic MH - Treatment Failure EDAT- 2005/02/03 09:00 MHDA- 2005/07/13 09:00 CRDT- 2005/02/03 09:00 PHST- 2005/02/03 09:00 [pubmed] PHST- 2005/07/13 09:00 [medline] PHST- 2005/02/03 09:00 [entrez] AID - S0006-4971(20)53462-9 [pii] AID - 10.1182/blood-2004-12-4837 [doi] PST - ppublish SO - Blood. 2005 Jun 1;105(11):4255-7. doi: 10.1182/blood-2004-12-4837. Epub 2005 Feb 1.