CD40LG and acute lymphoblastic leukemia: Bone marrow biopsy with immunophenotyping confirmed precursor T-ALL (CD3 87%, CD5 89%, CD7 78%, CD10 4%, CD19 4%, CD20 1%, CD22 5%, CD 34 42%, HLA-DR 7%, CD11B 14%, CD13 16%, CD14 16%, CD15 6%, CD 33 13%, CD45 98%, CD117 0.3%, cyCD3 37%, cyCD22 2%, cyCD64 3%, cyCD79a 7%, cytoplasmic IgM 4%, myeloperoxidase 5%, terminal deoxynucleotidyl transferase 4%, kappa 1%, lambda 1%, surface IgM 1%).