Evidence based medicine is essential to further develop the state of the art for cancer treatments. We introduce the levels of evidence for Taxotere treatment against various solid tumors. Most evidence for Taxotere therapy was produced in other countries. However, in Japan we have some data from phase II clinical trials for the approval of Taxotere. We review these domestic results, which reveal its usefulness and toxicity in Japanese patients. In addition, we analyze the evidence from the data of clinical trials of Taxotere conducted by investigators in the USA/Europe. Japanese physicians or academies must build a consensus for the application of Taxotere to Japanese patients with solid tumors.