title: Expression of multidrug resistance-related genes does not contribute to risk factors in newly diagnosed childhood acute lymphoblastic leukemia.
abstract: BACKGROUND
  The present study was designed to evaluate the association of multidrug resistance gene (MDR1), multidrug resistance-associated protein (MRP) gene and lung resistance protein (LRP) gene expression (mRNA levels) with risk factors such as phenotype, age and leukocyte count in newly diagnosed childhood acute lymphoblastic leukemia, because biological mechanisms contributing to risk factors were not known.
  
  
  METHODS
  Expression of the MDR1, MRP and LRP genes in leukemic cells from 40 pediatric patients was quantitated using the reverse transcriptase polymerase chain reaction method. The associations of expression of these genes with age and leukocyte count, which are known as risk factors for acute lymphoblastic leukemia (ALL), were analyzed. Moreover, the associations with clinically classified risk-related groups (high-risk ALL and low-risk ALL) were also investigated.
  
  
  RESULTS
  No positive correlations between expression of these genes and age or leukocyte count were found. The expression of these genes was not different among clinically classified risk-related groups.
  
  
  CONCLUSIONS
  Expression (mRNA levels) of the MDR1, MRP and LRP genes did not contribute to risk factors in newly diagnosed childhood acute lymphoblastic leukemia.
authors.affiliation: Department of Pediatrics, Niigata University School of Medicine, Japan. u-makoto@med.niigata-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Kakihara
authors.forename: A
authors.initials: A
authors.lastname: Tanaka
authors.forename: A
authors.initials: A
authors.lastname: Watanabe
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: K
authors.initials: K
authors.lastname: Kanto
authors.forename: S
authors.initials: S
authors.lastname: Kataoka
authors.forename: A
authors.initials: A
authors.lastname: Ogawa
authors.forename: K
authors.initials: K
authors.lastname: Asami
authors.forename: M
authors.initials: M
authors.lastname: Uchiyama
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D018432:Drug Resistance, Multiple / Q000235:genetics*; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D005260:Female; D015870:Gene Expression; D006801:Humans; D007223:Infant; D008297:Male; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012307:Risk Factors; D018709:Statistics, Nonparametric
chemical_list: D012333:RNA, Messenger