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[Two patients effectively treated with S-1 therapy for liver metastasis of breast cancer resistant to other anticancer drugs].

We had 2 patients with marked shrinkage of liver metastasis by administration of the oral fluorinated pyrimidine anticancer drug S-1 for advanced/recurrent breast cancer that was resistant to taxane and another antitumor drugs. Both patients almost completed the full dose through the whole course of treatment,and the drug showed good tolerability. S-1 was considered to possess beneficial antitumor efficacy and tolerability and to be promising as home chemotherapy for advanced/recurrent breast cancer.