title: Effect of the combination of docetaxel, zoledronic acid, and a COX-2 inhibitor on the growth of human breast cancer cell lines.
abstract: Current trends in the treatment of human tumors are with drug combinations that result in improved responses as well as the ability to use less toxic concentrations of the drugs. Recent reports have shown that COX-2 inhibitors and taxanes are effective in the suppression of human tumor growth. The bisphosphonate, zoledronic acid, primarily used in the treatment of bone metastases, also inhibits proliferation and induces apoptosis in human breast and prostate carcinoma and multiple myeloma. HER-2/neu overexpression has been suggested as a mechanism for resistance to both hormonal therapy as well as chemotherapy. This study examines the effects of combining a cyclooxygenase-2 inhibitor with zoledronic acid and/or docetaxel in a HER-2/neu transfected and control human breast cancer cell line. All three compounds produced dose-dependent growth inhibition in both cell lines. The HER-2/neu transfected MCF/18 cells, however, were less sensitive to zoledronic acid than the control MCF/neo cells, 9% to 53% inhibition and 18% to 67%, respectively. Enhanced growth inhibition was observed in both cell lines with the combination of docetaxel and SC236 and the combination of docetaxel and zoledronic acid. The combination of SC236 with zoledronic acid also gave an enhanced inhibitory effect in the MCF/neo line. This combination, however, was additive in the HER-2/neu transfected MCF/18 cell line. The triple combination of SC236, zoledronic acid and/or docetaxel resulted in a small increase in growth inhibition compared to that seen with the double combinations.
authors.affiliation: Penn State College of Medicine, Hershey, Pennsylvania 17033, USA.
authors.forename: Lois M
authors.initials: LM
authors.lastname: Witters
authors.forename: Jamie
authors.initials: J
authors.lastname: Crispino
authors.forename: Terri
authors.initials: T
authors.lastname: Fraterrigo
authors.forename: Jonathan
authors.initials: J
authors.lastname: Green
authors.forename: Allan
authors.initials: A
authors.lastname: Lipton
mesh_terms: D000971:Antineoplastic Combined Chemotherapy Protocols / Q000494:pharmacology*; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000235:genetics; D002455:Cell Division / Q000187:drug effects; D045744:Cell Line, Tumor; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology*; D004164:Diphosphonates / Q000494:pharmacology*; D000077143:Docetaxel; D018734:Genes, erbB-2; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology*; D007527:Isoenzymes / Q000037:antagonists & inhibitors*; D008565:Membrane Proteins; D011451:Prostaglandin-Endoperoxide Synthases; D011720:Pyrazoles / Q000494:pharmacology*; D013449:Sulfonamides / Q000494:pharmacology*; D043823:Taxoids / Q000494:pharmacology*; D014162:Transfection; D000077211:Zoledronic Acid; D000096926:Benzenesulfonamides
chemical_list: D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D004164:Diphosphonates; D000077143:Docetaxel; D007093:Imidazoles; D007527:Isoenzymes; D008565:Membrane Proteins; D011451:Prostaglandin-Endoperoxide Synthases; D011720:Pyrazoles; D013449:Sulfonamides; D043823:Taxoids; D000077211:Zoledronic Acid; C119130:4-(5-(4-chlorophenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl)benzenesulfonamide; D000096926:Benzenesulfonamides; C496540:PTGS2 protein, human