ALLOGENEIC HEMATOPOIETIC STEM CELL TRANSPLANTATION FOR CHILDREN WITH SEVERE COMBINED IMMUNODEFICIENCY (SCID) I.Tezcan, T.Turul, D. Uckan, M.Cetin, O.Sanal,

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ALLOGENEIC HEMATOPOIETIC STEM CELL TRANSPLANTATION FOR CHILDREN WITH SEVERE COMBINED IMMUNODEFICIENCY (SCID) I.Tezcan, T.Turul, D. Uckan, M.Cetin, O.Sanal, F.Ersoy Hacettepe University Children’s Hospital Immunology Unit

SCID a rare congenital syndrome a clinical phenotype in which absence of antigen specific T and B lymphocyte immunity a variety of underlying genetic abnormalities fatal unless hematopoietic stem cell transplantation (HSCT) is performed

Patient Characteristics-1 46 patients with SCID enrolled in the study 48 transplantations have been performed totally during June May 2005 in Hacettepe University Ihsan Dogramaci Children’s Hospital

SCID phenotypes T-B+NK- 12 (26%) T-B+NK+ 13 (28.2%) T-B-NK+ 17 (37%) T-B-NK- 1 (2.2%) T+B-NK+ 2 (4.4%) T+B+NK+ 1 (2.2%)

Patient Characteristics-2 SCID phenotype No. of patients B+ SCID B- SCID CID (combined immunodeficiency) Total

B+SCID B-SCID CID Median age of diagnosis (months) M/F ratio Total number 6.5 (1-72) 7.5 (1-12) 7 (4-11) 18/7 12/6 2/

No. of patients IdenticalHaplo - identical B B CID 2 1 Total 33 13

no.of patients Identical Haplo- Identical BM tx PSCT(CD34) PSCT Median # Nucl. cell (x10 8 /kg) CD34(x10 6 /kg) >1 stem cell Tx 1 1 Median age at tx (months) 7.5 (1.5-90) 8.5 (3-25) Median follow up(months) 21 ( ) 7 (2-59)

No of patients Tx typeGVHDBOBCG Inf. ExitusAlive HLA Identic ( 33.3) 21 (63.6) Haplo Identic (61.5) 5 (38.5) Total # % 10 (21.7) 3 (6.5) 4 (8.7) 19 (41.3) 27 (58.7)

Long term survival in severe combined immunodeficiency: The role of persistent maternal engraftment 8-year-old male (maternal engraftment): recurrent resp. tract inf., oral apht., bifid thumb, cafe au lait spots, skin manifestations 46XX karyotype analysis of blood %32 of monocytes are XX, %68 XY All fibroblasts are %100 XY 6 months old male (classical T-B+NK- SCID): persistant diarrhea JAK3 deficiency ( kindly performed by Genevieve De Saint Basile, Hopital Necker)

T-B-NK+ SCID HLA identical BMT from mother At +5 posttransplant month  pancytopenia HSV PCR (+) Significant improvement – Acyclovir treatment

Immune reconstitution at posttx. 6 months B+B-CID HLA Iden. B cell fx. T cell fx. (n=14) 9/14 14/14 (n=6) 4/6 6/6 (n=2) 1/2 Haploiden. B cell fx. T cell fx. (n=4) 0/4 3/4 (n=3) 0/3 1/3 -

Death analysis of HLA identical Tx patientsAlive (%)Death (%) Age at tx <6 months >6 months (83.3) 12 (57.2) 2 (16.6) 9 (42.8) SCID pheno. B+ B- CID NK+ NK (61.9) 7 (70) 2 (100) 16 (64) 6 (75) 8 (38.1) 3 (30) 0 (0) 9 (36) 2 (25) Pulmonary inf before tx. Yes No (35.7) 9 (90) 9 (64.3) 1 (10) >3 months posttx <3 months posttx 2 (18.1) 9 (81.9)

In Conclusion; Prognosis in HLA identical tx was found to be assoc. with Age of tx (>6 months) Presence of pulmonary inf. before tx