Tolyporphin A sensitized the cell lines SKVLB1 and MCF-7/ADR (now known to be an ovarian cancer cell line) [207,208], which also over-express P-glycoprotein, to daunomycin, taxol, actinomycin D, and colchicine, “without increasing cell sensitivity to compounds that are not subject to removal by P-glycoprotein, i.e., cisplatin and mephalan” [21]. The gene discussed is ABCB1; the disease is ovarian cancer.