title: [4 cases of B-cell type acute lymphatic leukemia resistant to chemotherapy].
mesh_terms: D000293:Adolescent; D000328:Adult; D001402:B-Lymphocytes / Q000276:immunology*; D005260:Female; D006801:Humans; D007945:Leukemia, Lymphoid / Q000188:drug therapy / Q000276:immunology*; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged