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Combination Index (CI) values applying to the sequenced combinations of a) CB, b) OX and c) CH1 with BORT administered to the ovarian A2780, A2780cisR, A2780ZD0473R and SKOV-3 cancer cell lines. CI values were calculated following 72 h treatments with the drugs at their equipotent ratios. CI values of <1, =1 and >1 indicate respectively synergism, additivity and antagonism in combined drug action.
