Platelet parameters and expression of platelet membrane glycoprotein in childhood acute lymphoblastic leukemia.

Platelet activation and functional changes were investigated in acute lymphoblastic leukemia (ALL) to provide the basis for early diagnosis and evaluation of curative effect. Platelet parameters, immature platelet fraction (IPF%), immature platelet count (IPC), P-selectin (CD62p) (PAC-1) expression were detected in ALL, ALL-complete remission-induced (CR1), and normal groups with an automatic blood cell analyzer and flow cytometer. CD62p and PAC-1 were higher in the ALL group before adenosine-5-diphosphate (ADP) activation than in the normal group (P < 0.05); PAC-1 expression was higher and lower in the ALL-CR1 group than in normal and ALL groups (P < 0.05), respectively. CD62p and PAC-1 expression was lower in the ALL group than in the normal group after ADP activation (P < 0.05); PAC-1 expression was lower and higher in the ALL-CR1 group than in normal and ALL groups, respectively (P < 0.05). Platelet count (PLT), mean platelet volume (MPV), platelet hematocrit (PCT), and platelet distribution width (PDW) were lower in the ALL group than in the ALL-CR1 group (P < 0.05). PLT, MPV, and PCT did not differ between the ALL-CR1 group and the normal group (P > 0.05). PDW did not differ statistically among all groups (P > 0.05). IPF% and IPC values were higher and lower in the ALL group than in normal and ALL-CR1 groups (P < 0.05), respectively. These did not differ significantly between the normal group and the ALL-CR1 group (P > 0.05). Therefore, ALL patients demonstrate platelet activation and platelet dysfunction; platelet parameters and membrane glycoprotein expression can be used to evaluate the effect of ALL.