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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

In vitro and in vivo effects of cisplatin and etoposide in combination on small cell lung cancer cell lines.

The effects of cisplatin ( CDDP) and etoposide (ETP) in combination were evaluated in vitro and in vivo using small cell lung cancer cell lines. The combination effects in vitro were investigated using isobologram analysis. Used together, CDDP and ETP showed a synergistic effect against cell growth on only 1 cell line (SBC-3), additive effects on 6 (SBC-2, SBC-5, Lu130, Lu134AH, Lu135T and H69) and an antagonistic effect on 1 (SBC-1). In the in vivo experiment, nude mice were inoculated with SBC-1, SBC-3 and SBC-5 cells. Two or 5 mg/kg CDDP and 10 or 30 mg/kg ETP were administered intraperitoneally alone and simultaneously in combination to nude mice. The in vivo effects of the combination were determined by comparing the observed growth ratio in mice treated with the combination with the expected value of this ratio calculated based on the assumption that the effects of the drugs were simply additive. According to this definition, synergistic effects were observed against all 3 tumors. Thus, the in vivo and in vitro effects differed. The toxicity of the combination therapy, which was analyzed by estimating the body weight change of mice, was no higher than that of CDDP or ETP alone. These results suggest that the excellent clinical effects of CDDP and ETP combination therapy may be attributable not to drug interaction at the cellular level but to the feasibility of combined use of them at full doses without overlapping side effects.[1]


  1. In vitro and in vivo effects of cisplatin and etoposide in combination on small cell lung cancer cell lines. Kondo, H., Kanzawa, F., Nishio, K., Saito, S., Saijo, N. Jpn. J. Cancer Res. (1994) [Pubmed]
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