CSF2 and acute lymphoblastic leukemia: Concerning VEGF levels, even though at unstimulated conditions no significant differences were visible between different leukaemia types, PHA and LPS stimulation revealed substantial differences between AML and BCP-ALL blasts (375.4 pg/mL vs. 158.5 pg/mL, p = 0.0135, for PHA stimulation, respectively and 381.9 pg/mL vs. 149.1 pg/mL, p = 0.023, for LPS stimulation, respectively), as was also seen for G-CSF and GM-CSF.