Nasopharyngeal carcinoma (NPC) is a prevalent cancer in Taiwan. To improve the treatment of NPC, we have extensively searched for effective combination chemotherapies. Our previous studies indicated that vitamin K3 (VK3) inhibits the growth of NPC CG1 cells in vitro. In this study, we further studied the binary/ternary combined effects of VK3 with other anticancer drugs against NPC cells. The antitumor effects of different VK3 combinations against CG1 cells were determined by using MTT assay, and the combined effects were evaluated by a taibologram, a modified isobolographic method being developed in our laboratory for the analyses of binary/ternary combinations of anticancer agents. Binary combinations of VK3 with doxorubicin (DOX), vinblastine (VBL), or 5-fluorouracil (5-FU) result in synergistic effects. For three-drug combinations, a remarkable synergy was found in the combination of VK3, VBL, and 5-FU. These in vitro results will provide useful information not only for further mechanistic studies and but also for future clinical trials of VK3-based cancer chemotherapy of NPC.

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