MHC class II deficiency is a rare, but life-threatening, primary combined immunodeficiency. Hematopoietic cell transplantation (HCT) remains the only curative treatment for this condition, but transplant survival in the previously published result was poor. We analyzed the outcome of 25 patients with MHC class II deficiency undergoing first HCT at Great North Children's Hospital between 1995 and 2018. Median age at diagnosis was 6.5 months (birth to 7.5 years). Median age at transplant was 21.4 months (0.1-7.8 years). Donors were matched family donors (MFDs; n = 6), unrelated donors (UDs; n = 12), and haploidentical donors (HIDs; n = 7). Peripheral blood stem cells were the stem cell source in 68% of patients. Conditioning was treosulfanbased in 84% of patients; 84% received alemtuzumab (n = 14) or anti-thymocyte globulin (n = 8) as serotherapy. With a 2.9-year median follow-up, OS improved from 33% (46-68%) for HCT before 2008 (n = 6) to 94% (66-99%) for HCT after 2008 (n = 19; P = .003). For HCT after 2008, OS according to donor was 100% for MFDs and UDs and 85% for HIDs (P = .40). None had grade III-IV acute or chronic graft-versus-host disease. Latest median donor myeloid and lymphocyte chimerism were 100% (range, 0-100) and 100% (range, 64-100), respectively. Latest CD4+ T-lymphocyte number was significantly lower in transplant survivors (n = 14) compared with posttransplant disease controls (P = .01). All survivors were off immunoglobulin replacement and had protective vaccine responses to tetanus and Haemophilus influenzae. None had any significant infection or autoimmunity. Changing transplant strategy in Great North Children's Hospital has significantly improved outcomes for MHC class II deficiency.

Chronic granulomatous disease (CGD), an inherited immunodeficiency resulting from defects in the reduced NAD phosphate oxidase complex rendering phagocytes deficient in producing the superoxide anion necessary for normal killing of bacterial and fungal microorganisms, leads to severe and recurrent infections, inflammatory granulomatous complications, and autoimmune diseases. 1 It is associated with substantial morbidity and premature death. Hematopoietic cell transplantation (HCT) is the only long-term curative therapy; however, historically, utility was limited by high rates of graft failure and transplant-related morbidity and mortality. Transplant survival and graft outcome have improved dramatically over the past 10 years as a result of reduced-toxicity conditioning (RTC) regimens, detailed graftselection hierarchy, superior HLA-matching technology, better cell-dosed grafts, greater availability of grafts, improved supportive care, and more effective antimicrobial therapy. We studied transplant survival post-HCT for CGD in a supraregional immunology transplant center in the United Kingdom.

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