title: Immunoassays of urokinase (uPA) and its type-1 inhibitor (PAI-1) in detergent extracts of breast cancer tissue.
abstract: Two immunoassays for quantitation of the biological markers uPA and PAI-1 were evaluated for their use with detergent extracts of breast cancer tissue. Both assays were based on murine monoclonal capture antibodies and rabbit polyclonal detector antibodies. Horseradish peroxidase-conjugated goat anti-rabbit antibodies enabled measurement of the bound antigen. The detection limit of the uPA assay was 13 pg/ml, with a linear dose-response relationship up to 350 pg/ml. The assay detected free uPA as well as uPA in complex with PAI-1 and/or with its receptor. The detection limit of the PAI-1 assay was 50 pg/ml, with a linear dose-response relationship up to 1500 pg/ml. The assay detected both free PAI-1 and uPA:PAI-1 complex. Both assays were validated for detergent extracts using immunoabsorption and recovery tests. Highly significant associations between tumour tissue uPA and PAI-1 levels and prognosis were verified in a cohort of 164 lymph node-negative primary breast cancer patients. It is concluded that the two immunoassays are well-suited for the quantitation of uPA and PAI-1 in detergent extracts of breast cancer tissues.
authors.affiliation: Department of Oncology, Finsen Centre, Rigshospitalet, DK-2100 Copenhagen, Denmark. a.n.pedersen@rh.dk
authors.forename: A N
authors.initials: AN
authors.lastname: Pedersen
authors.forename: H T
authors.initials: HT
authors.lastname: Mouridsen
authors.forename: D Y
authors.initials: DY
authors.lastname: Tenney
authors.forename: N
authors.initials: N
authors.lastname: Brünner
mesh_terms: D015153:Blotting, Western; D001943:Breast Neoplasms / Q000737:chemistry*; D018270:Carcinoma, Ductal, Breast / Q000737:chemistry*; D018572:Disease-Free Survival; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000379:methods; D007150:Immunohistochemistry; D017395:Plasminogen Activator Inhibitor 1 / Q000032:analysis*; D011379:Prognosis; D016016:Proportional Hazards Models; D012680:Sensitivity and Specificity; D014407:Tumor Cells, Cultured; D014568:Urokinase-Type Plasminogen Activator / Q000032:analysis*
chemical_list: D017395:Plasminogen Activator Inhibitor 1; D014568:Urokinase-Type Plasminogen Activator