Ovarian cancer cell lines were subjected to a gradual increase in the concentration of Olaparib (from 0.5 to 20 µM) to allow for the development of acquired resistance. Cells with acquired resistance to Olaparib (designated as OlaR) were developed after 3–4 months in drug media. The established Olaparib resistance models were maintained in culture medium with low-concentration Olaparib, and dosing was temporarily ceased prior to conducting experiments.
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