[Biological characteristics of hyperleukocytic acute leukemia]

The study was to investigate the biological characteristics of hyperleucocyte acute leukemia (HAL) and its clinical significance. Immunophenotyping was performed in 48 HAL patients and 73 NHAL patients by three-color flow cytometry analysis using CD45/SSC gating, meanwhile the cytogenetic analysis was performed in 74 patients. The results showed that as compared with NHAL group, HAL group had lower proportion of eryth-lineage in bone marrow (P < 0.05); in AML, the CD14 expression of HAL group was apparently higher than that of NHAL group (P < 0.05); in ALL, HAL group had higher expression of CD8 and lower expression of CD22, cCD79a compared with NHAL group (P < 0.05); the two groups had no significant difference in expression of special lineage antigens and overlapping lineage antigens (P > 0.05). The CR rate of HAL group was lower than that of NHAL group. It is concluded that bone marrow inhibition of HAL group is more severe than that of NHAL group. In AML, monocytic leukemia is easier to become into HAL than other leukemias. In ALL, T-lineage antigens of HAL group are more easily expressed than those of NHAL group; the leukemia cells of HAL group are naiver than those of NHAL group, meanwhile the prognosis of HAL is poor.