| Summary: | Cytotoxic agents which are used in cancer chemotherapy reduced several times the number of neoplastic cells but not fully. Therefore, usage of and ldquo;targeted therapeutics" which were developed with much more rational approach is increasing markedly in patients with solid cancer. Targeted therapeutics due to selective targets aims cancer cells with specific molecular defect thereby, kils the cancer cells, which makes it possible to continue normal cells in a healthy environment. The rapid emergence of hundreds of new agents that modulates ever-growing list of the cancer-specific molecular targets promise great hope for cancer patients. Evaluation of the target agent individually, in combination with standard therapy and other target agents bring about important development challenges. As possible combinations of drugs number is unlimited, the identification of the most promising combinations and giving priority to assessing their strategies are very important.In this article important elements of the development strategy of the target agent combinations will be considered. Difficulties in this kind of combinations of rational pre-clinical and clinical evaluation and possible approaches to overcome these challenges will be discussed. [Archives Medical Review Journal 2015; 24(4.000): 432-451]
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