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“In 10 of 11 samples, … multi-drug resistance (Mdr) modulator quinidine altered nuclear daunorubicin ( DNR ) accumulation and whole-cell TPT accumulation by less than 15%, which suggests that Pgp-mediated effects on drug efflux are insufficient to explain the fourfold range of TPT sensitivities in the colony-forming assays.”
Journal of clinical oncology : official journal of the American Society of Clinical Oncology • 1994 | View Paper
“Known Pgp inhibitors, such as cyclosporin A, nicardipine, verapamil, quinidine , terfenadine, tamoxifen, and vinblastine were demonstrated to inhibit the Pgp-mediated efflux of daunorubicin.”
Drug metabolism and disposition: the biological fate of chemicals • 2000 | View Paper
“ATP-dependent daunomycin transport was inhibited by cytotoxic drugs (vinblastine, vincristine, and adriamycin) and other drugs, such as verapamil and quinidine , which restore anti-cancer drug sensitivity in resistant cells.”