CD4 and acute lymphoblastic leukemia: Furthermore, the cytotoxicity of compound 1 (PT162, NSC 796018) towards CCRF−CEM cells (ATCC® CCL-119TM, acute lymphoblastic leukemia cells, tumorigenic CD4+ T lymphoblasts) [94] and Vero cells [African green monkey (grivet) Chlorocebus aethiops (syn.