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We investigated the inhibitory effect of oral administration of Juzen-taiho-to, a Kampo Japanese herbal medicine, and its related formulations on the experimental liver and lung metastasis of tumor cells in vivo. Oral administration of Juzen-taiho-to for 7 d before tumor inoculation significantly reduced the number of liver metastatic colonies of colon 26-L5 carcinoma cells and attenuated the increase of liver weight in a dose-dependent manner ranging from 4 to 40 mg/d. Its oral administration for this same period before tumor inoculation also significantly inhibited lung metastasis of B16-BL6 melanoma cells. Juzen-taiho-to originally consisted of 8 crude drugs derived from Shimotsu-to and Shikunshi-to prescriptions together with two crude drugs (Cinnamomi Cortex and Astragali Radix). Oral administration of Shimotsu-to as well as Juzen-taiho-to for 7 d before tumor inoculation resulted in a significant reduction in the number of metastatic colonies and the liver weight as compared with the control, whereas Shikunshi-to did not exhibit such an inhibitory effect. Unsei-in containing four Shimotsu-to constituents was also active in inhibiting liver metastasis. Toki-shakuyaku-san and Ninjin-yoei-to, which include all Shimotsu-to constituents except Rehmanniae Radix and Cnidii Rhizoma, respectively, did not show a significant anti-metastatic effect. Rikkunshi-to and Ninjin-yoei-to, which contain Shikunshi-to constituents, did not affect the inhibition of liver metastasis. Hochu-ekki-to treatment before tumor inoculation also led to a significant inhibition of liver metastasis, probably through an inhibitory mechanism different from Juzen-taiho-to. These results suggest that the anti-metastatic effect of Juzen-taiho-to is partly associated with its Shimotsu-to-derived constituents.

Expression of the Anti-metastatic Effect Induced by Juzen-taiho-to is Based on the Content of Shimotsu-to Constituents.