title: [Clinic Significance of Expression of bcl-2 and bax Gene in Patients with Acute Leukemia and its Relationship with mdr-1 Gene Expression]
abstract: It is generally accepted that the inhibition of apoptosis is one of the mechanism of drug resistance to tumor. Members of the bcl-2 gene family are the most important regulators in apoptosis. The purpose of this study is to evaluate the value of expression of bcl-2 and bax gene in predicting the prognosis of acute leukemia patients, and to explore the relationship between bcl-2 and bax expression and drug resistance. Seventy patients with acute leukemia entered this study. Expressions of bcl-2, bax and mdr-1 gene were measured by RT-PCR method and FCM. The result showed that: bcl-2 had been widely detected in specimens of blood or bone marrow from acute leukemia patients, the expression levels were much higher than those in normal control (1.46 vs 0.71, P < 0.05), bax expression levels and bax/bcl-2 ratio in patients had no significant difference with the control. No relationships were found between the expression levels of bcl-2 and bax and AL patients' age, sex, platelet counts, hemoglobin levels, percentage of marrow blasts, FAB classification, and S + G(2)M%. Both Bcl-2 protein expression (34.6% vs 69.2%, P < 0.03) and bax/bcl-2 mRNA ratio (37.1% vs 82.9%, P < 0.01) were associated with response to therapy and CR rate, bax/bcl-2 ratio also influences the overall survival time. There was no relationship between bcl-2 and bax expression levels and mdr-1 expression levels.
authors.affiliation: Department of Hematology, The Second Hospital, Hebei Medical University, Shijiazhuang 050000, China.
authors.forename: Xiao-Ling
authors.initials: XL
authors.lastname: Guo
authors.forename: Zuo-Ren
authors.initials: ZR
authors.lastname: Dong
authors.forename: Fu-Xu
authors.initials: FX
authors.lastname: Wang
authors.forename: Xing-Yan
authors.initials: XY
authors.lastname: Du
authors.forename: Feng-Ru
authors.initials: FR
authors.lastname: Lin
authors.forename: Er-Gu
authors.initials: EG
authors.lastname: Yao