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• W4361949905 abstract "<div>Abstract<p><b>Purpose:</b> P-glycoprotein (Pgp) antagonists have been difficult to develop because of complex pharmacokinetic interactions and a failure to show meaningful results. Here we report the results of a pharmacokinetic and pharmacodynamic trial using a third-generation, potent, noncompetitive inhibitor of Pgp, tariquidar (XR9576), in combination with docetaxel.</p><p><b>Experimental Design:</b> In the first treatment cycle, the pharmacokinetics of docetaxel (40 mg/m²) were evaluated after day 1 and day 8 doses, which were administered with or without tariquidar (150 mg). ^99mTc-sestamibi scanning and CD56⁺ mononuclear cell rhodamine efflux assays were conducted to assess Pgp inhibition. In subsequent cycles, 75 mg/m² docetaxel was administered with 150 mg tariquidar every 3 weeks.</p><p><b>Results:</b> Forty-eight patients were enrolled onto the trial. Nonhematologic grade 3/4 toxicities in 235 cycles were minimal. Tariquidar inhibited Pgp-mediated rhodamine efflux from CD56⁺ cells and reduced ^99mTc-sestamibi clearance from the liver. There was striking variability in basal sestamibi uptake; a 12% to 24% increase in visible lesions was noted in 8 of 10 patients with lung cancer. No significant difference in docetaxel disposition was observed in pairwise comparison with and without tariquidar. Four partial responses (PR) were seen (4/48); 3 in the non–small cell lung cancer (NSCLC) cohort, measuring 40%, 57%, and 67% by RECIST, and 1 PR in a patient with ovarian cancer.</p><p><b>Conclusions:</b> Tariquidar is well tolerated, with less observed systemic pharmacokinetic interaction than previous Pgp antagonists. Variable effects of tariquidar on retention of sestamibi in imageable lung cancers suggest that follow-up studies assessing tumor drug uptake in this patient population would be worthwhile. <i>Clin Cancer Res; 17(3); 569–80. ©2010 AACR</i>.</p></div>" @default.
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• W4361949905 date "2023-03-31" @default.
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• W4361949905 title "Data from A Pharmacodynamic Study of Docetaxel in Combination with the P-glycoprotein Antagonist Tariquidar (XR9576) in Patients with Lung, Ovarian, and Cervical Cancer" @default.
• W4361949905 doi "https://doi.org/10.1158/1078-0432.c.6519969.v1" @default.
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