PC/DX25 and DU/DX50 cells were seeded at a density of 3 × 103 cells/well in 96-well plates with 100 μl RPMI-1640 medium containing 10% FBS and increasing concentration of docetaxel and CAPE for 96 h. Relative cell number was analyzed by measuring the DNA content of cell lysates with Hoechst dye 33,258-based 96-well proliferation assay (Sigma, St. Louis, MO, USA) as described previously [17 (link)]. All readouts were normalized to the average of the control condition in each individual experiment. The experiment was repeated at least eight times.
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