Clinical features and gene mutations of children with Shwachman-Diamond syndrome and malignant myeloid transformation
AN Wen-Bin1,2,3, LIU Chao1,2,3, WAN Yang1,2,3, CHANG Li-Xian1,2,3, CHEN Xiao-Yan1,2,3, ZHU Xiao-Fan1,2,3
State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
Abstract：Objective To study the clinical features and genetic mutations of children with Shwachman-Diamond syndrome (SDS) and malignant myeloid transformation. Methods Next-generation sequencing was used to analyze the gene mutations in 11 SDS children with malignant myeloid transformation, and their clinical features and genetic mutations were analyzed. Results Of the 11 children with SDS, 9 (82%) presented with refractory cytopenia of childhood (RCC), 1 (9%) had myelodysplastic syndrome with excess blasts (MDS-EB), and 1 (9%) had acute myeloid leukemia with myelodysplasia-related changes (AML-MRC). The median age of onset of malignant myeloid transformation was 48 months (ranged 7 months to 14 years). Of the 11 children, 45% had abnormalities in the hematological system alone. Mutations of the SBDS gene were detected in all 11 children, among whom 5 (45%) had c.258+2T > C homozygous mutation and 3 (27%) had c.184A > T+c.258+2T > C compound heterozygous mutation. The new mutations of the SBDS gene, c.634_635insAACATACCTGT+c.637_638delGA and c.8T > C, were rated as "pathogenic" and "possibly pathogenic" respectively. The 3-year predicted overall survival rates of children transformed to RCC and MDS-EB/AML-MRC were 100% and 0% respectively (P=0.001). Conclusions SDS children may have hematological system symptoms as the only manifestation, which needs to be taken seriously in clinical practice. The type of malignant transformation is associated with prognosis.
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