Summary:Patients with Shwachman-Diamond syndrome (SDS) have an increased frequency of myelodysplasia and leukemic transformation. We described two patients who received allogeneic stem cell transplantation and developed multiple complications, including seizure, hyperglycemia and renal tubular acidosis. A review of the literature showed that patients with SDS appeared to have an increased incidence of various transplantassociated problems. These patients frequently have underlying organ dysfunction and should be managed with extreme caution when treated with allogeneic stem cell transplantation. Keywords: Shwachman-Diamond syndrome; myelodysplasia; leukemia; BMT; complications Shwachman-Diamond syndrome (SDS) is a rare autosomal recessive disorder characterized by exocrine insufficiency, short stature, skeletal abnormalities and bone marrow dysfunction. There is an increased risk of marrow aplasia and leukemic transformation, the latter often preceded by a phase of myelodysplasia (MDS). 1,2 Allogeneic stem cell transplantation offers potentially curative treatment for MDS, leukemia and marrow failure syndromes. Few patients with SDS have undergone BMT. We report our experience of allogeneic BMT in two SDS patients who developed MDS and monosomy 7 abnormality. Severe complications were encountered in both cases. We reviewed the outcome of allotransplantation in other patients published in the literature and noticed a significant number of post-transplant problems.
Case 1An 8-year-old boy with MDS/monosomy 7 had a past history of short stature, growth hormone deficiency, recurrent diarrhea and loss of mineralization of distal femora. CT scan of the abdomen showed a fatty pancreas and serum amylase and lipase activity were virtually absent. He received a CD5, CD8 T cell-depleted (Applied Immune Sciences, Santa Clara, CA, USA), unrelated donor (micromismatched at 1 HLA-DR locus) BMT after conditioning with thiotepa 5 mg/kg i.v. on day −7, CY 60 mg/kg i.v. on day −6, −5 and TBI 3 Gy/day on days −4 to −1. GVHD prophylaxis included CsA, short Mtx and MP. The post-BMT course was complicated by several episodes of seizure of unknown etiology. Later on he developed severe electrolyte wasting as the result of renal tubular acidosis. He had grade IV GVHD that failed to respond to MP, antithymocyte globulin and hydroxychloroquine therapy. He became severely hyperglycemic (blood sugar Ͼ1000 mg%) and hypernatremic after pulse MP therapy. This responded slowly to insulin and hydration. He died on day 93 of pulmonary hemorrhage. An autopsy was not performed. His ANC exceeded 500/mm 3 on day 18 but he remained platelet and red cell transfusion-dependent. A bone marrow examination on day 31 showed 1.2% blasts and normal cytogenetics.
Case 2A 9-year-old child with a history of short stature, growth hormone deficiency, and metaphyseal chondroplasia developed marrow hypoplasia. Bone marrow examination 2 years later revealed myelofibrosis, with monosomy 7 and + i(7q) cytogenetic abnormalities. A MRI of the abdomen showed hemosiderosis...