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To the editor:A 25-year-old male had been well until October 2009,when he developed abdominal pain,diarrhea,and fever.The results of the hematological examination were as follows.White blood cells were 108.76× 109/L.The bone marrow was hypercellular with 32.5% lymophoblasts and 55.5% infantile lymphocytes which were cytochemically positive for PAS.Flow cytometric analysis revealed that the blasts were positive for CD7,CD2,CD3,CD8,TCR-α-β-1,CD38,CD19,CD13,pgP,CD56,cyCD79a,and CD117.