title: Expression of the multidrug resistance gene in osteosarcoma: a pilot study.
abstract: Resistance to combination chemotherapy remains a challenge in the treatment of osteosarcoma yet has not been studied extensively in this tumour. One mechanism of multiple drug resistance is increased expression of the multidrug resistance gene (mdr1). The level of mdr1 messenger RNA (mRNA) expression has been found to correlate with the degree of drug resistance in a number of tumour cell lines in vitro, which suggests that it also may be useful as a predictor of similar resistance in vivo. Using a highly sensitive assay based on the polymerase chain reaction to measure the amount of mdr1 mRNA, we detected various levels of mdr1 expression in 18 osteosarcoma specimens from 15 patients with resectable nonmetastatic osteosarcoma. At follow-up at a minimum of 30 months later, a trend toward a worse outcome was observed in patients with tumours exhibiting high levels of mdr1 expression. The results of this pilot study suggest that a larger scale prospective investigation of the effect of mdr1 gene expression on outcome in osteosarcoma is warranted.
authors.affiliation: Division of Orthopaedic Surgery, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.
authors.forename: J S
authors.initials: JS
authors.lastname: Wunder
authors.forename: R S
authors.initials: RS
authors.lastname: Bell
authors.forename: L
authors.initials: L
authors.lastname: Wold
authors.forename: I L
authors.initials: IL
authors.lastname: Andrulis
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000293:Adolescent; D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D002352:Carrier Proteins / Q000235:genetics*; D002648:Child; D004351:Drug Resistance / Q000235:genetics*; D005260:Female; D015870:Gene Expression; D006801:Humans; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics*; D008875:Middle Aged; D012516:Osteosarcoma / Q000188:drug therapy / Q000235:genetics*; D010865:Pilot Projects
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D002352:Carrier Proteins; D008562:Membrane Glycoproteins