2007 Volume 14 Issue 4 Pages 401-405
Background: The dose-response curve for anticancer agents cannot be evaluated by studying patients directly. To investigate individual differences in the dose-response curve for paclitaxel in breast cancer, we utilized the histoculture drug response assay (HDRA) technique.
Materials and Methods: Twenty specimens obtained from breast cancer patients who underwent surgical resection were used in this study. The inhibition rates of paclitaxel at several concentrations were measured and fitted to a sigmoid dose-response curve, using non-linear least squares analysis with the fitting equation y=A(1-1/(1+exp(B(x-log(C))))), where A denotes maximal response; B, slope factor; and C, ED50.
Results: A dose-response curve was obtained in all tumors. The mean value (±SD) of maximum response, slope factor, and ED50 were 90.2±5.5%, 9.4±4.3, and 36.8±17.2µg/ml, respectively. The slope factor was higher in nuclear grade 3 tumors compared with nuclear grade 1 and 2 tumors.
Conclusion: An individual dose-response curve for paclitaxel in breast cancer can be obtained using the HDRA technique. Nuclear grade 3 tumors appeared to have more uniform chemosensitivity to paclitaxel compared with nuclear grade 1 and 2 tumors.
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