[Changes of Peripheral Blood Marrow-Derived Suppressor Cell Level after Chemotherapy Induction Remission by VDLP Regimen and Their Relationship with Immune System in B-ALL Children].

Objective: To investigate the changes of peripheral blood marrow-derived suppressor cell level after chemotherapy induction remission by regimen consisting of vincristine, daunorubicin, L-asparaginase and prednisone (VDLP) and to analyze their relationship with immume system in B-ALL children.

Methods: Thirty B-ALL children after induction remission by VDLP regimen from August 2015 to August 2016 were selected as B-ALL group and 30 normal healthy children were selected as control group. The peripheral blood in 2 groups was collected and detected by flow cytometry, then the ratios of CD30 cells and CD33 HLA-DR marrow-derived suppressor cells, CD14CD33HLA-DR marrow-derived suppressor cells and CD15CD33HLA-DR marrow-derived suppressor cells were calculated, and their changes after induction remission by VDLP regimen and the relationship with immune system were analyzed.

Results: After treatment the ratio of CD33 cells in peripheral blood of B-ALL group and control group was not significantly different (P> 0.05), moreover, the ratio of CD33 cells in B-ALL group was significantly higher than that before treatment (P<0.05), while the ratios of CD33 HLA-DR marrow-derived suppressor cells, CD14CD33HLA-DR marrow-derived suppressor cells and CD15CD33HLA-DR marrow-derived suppressor cells in B-ALL group were significantly lower than those in control group (all P<0.05), but the ratios of these cells in B-ALL group were higher than those before treatment, and yet there was no statistical significance (P>0.05).

Conclusion: The ratios of marrow-derived suppressor cells in peripheral blood of B-ALL children in complete remission after treatment with VDLP regimen are higher than those before treatment, but are significantly lower than normal value, which may be related with non-complese recovery of immune system in B-ALL children after treatment.