title: The combined analysis of P-glycoprotein expression and activity predicts outcome in childhood acute lymphoblastic leukemia.
abstract: The link between drug resistance and relapse was often suggested, but rarely demonstrated in long-range clinical studies. Since it is nowadays recommended to validate immunocytochemical results, the authors studied prospectively 52 acute lymphoblastic leukemia (ALL) patients with an immunocytochemical test and a functional flow cytometric test. The 4-year EFS and OS were 79.3% and 85.2%, respectively. Patients scoring positive in both tests had a significantly higher relapse rate and worse survival (log rank p = 0.007 and 0.047 for event-free survival and overall survival, respectively). Among the different prognostic variables evaluated, only the combination of P-gp expression and activity was a statistically significant parameter predicting relapse in childhood ALL.
authors.affiliation: Department of Pediatrics, Ghent University Hospital, Ghent, Belgium. Barbara.DeMoerloose@rug.ac.be
authors.forename: Barbara
authors.initials: B
authors.lastname: De Moerloose
authors.forename: Katrien
authors.initials: K
authors.lastname: Swerts
authors.forename: Yves
authors.initials: Y
authors.lastname: Benoit
authors.forename: Geneviève
authors.initials: G
authors.lastname: Laureys
authors.forename: Tom
authors.initials: T
authors.lastname: Loeys
authors.forename: Jan
authors.initials: J
authors.lastname: Philippé
authors.forename: Catharina
authors.initials: C
authors.lastname: Dhooge
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000032:analysis / Q000378:metabolism*; D045744:Cell Line, Tumor; D002648:Child; D002675:Child, Preschool; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D005260:Female; D005434:Flow Cytometry; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D007223:Infant; D008297:Male; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000453:epidemiology / Q000378:metabolism*; D011379:Prognosis; D011446:Prospective Studies; D012008:Recurrence; D012307:Risk Factors; D016019:Survival Analysis
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1