title: Analysis of P-glycoprotein expression in osteosarcoma.
abstract: Current treatment of high-grade osteosarcoma combines surgical removal of the lesion with chemotherapy. In this study we evaluated whether the expression of P-glycoprotein, a protein closely associated with multidrug resistance, may be helpful in identifying the patients whose tumours will be further resistant to specific agents. By using multidrug-resistant osteosarcoma cell lines as standards, the expression of P-glycoprotein was evaluated in 105 cases of primary and metastatic osteosarcoma by semiquantitative immunofluorescence. Overexpression of the protein was shown in 23% of primary and in 50% of metastatic lesions. In 38 cases, homogeneously treated and followed-up for at least 24 months, overexpression of P-glycoprotein appeared to be associated with a higher relapse rate and with a trend toward a worse outcome. These data support the role of P-glycoprotein in the response to chemotherapy and its involvement in the determination of the outcome of osteosarcoma patients.
authors.affiliation: Laboratorio di Ricerca Oncologica, Istituti Ortopedici Rizzoli, Bologna, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Serra
authors.forename: K
authors.initials: K
authors.lastname: Scotlandi
authors.forename: M C
authors.initials: MC
authors.lastname: Manara
authors.forename: D
authors.initials: D
authors.lastname: Maurici
authors.forename: S
authors.initials: S
authors.lastname: Benini
authors.forename: M
authors.initials: M
authors.lastname: Sarti
authors.forename: M
authors.initials: M
authors.lastname: Campanacci
authors.forename: N
authors.initials: N
authors.lastname: Baldini
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism*; D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002648:Child; D002675:Child, Preschool; D018572:Disease-Free Survival; D018432:Drug Resistance, Multiple / Q000502:physiology; D019008:Drug Resistance, Neoplasm / Q000502:physiology; D005260:Female; D005455:Fluorescent Antibody Technique; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000378:metabolism*; D012516:Osteosarcoma / Q000188:drug therapy / Q000378:metabolism* / Q000556:secondary; D011379:Prognosis; D016896:Treatment Outcome
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins