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platinum resistant cancer

(PLA-tih-num reh-ZIH-stunt KAN-ser)
Cancer that responds at first to treatment with drugs that contain the metal platinum, such as cisplatin and carboplatin, but then comes back within a certain period. For example, ovarian cancer that comes back within 6 months after treatment is considered platinum resistant. Knowing whether cancer is platinum resistant may help plan further treatment.
Search NCI's Dictionary of Cancer Terms