A total of 15 cases of advanced and recurrent breast cancer of more than 3-year duration were subjected to continuous intra-arterial infusion in our department, and its therapeutic effect and the judgement were examined. Using subclavian artery and internal thoracic artery for the primary cases and the latter artery for the recurrent cases for infusion, continuous administration of 5-FU and one-shot injection of ADM and MMC were performed twice a week. 99mTc-angiography was effective for the identification of arterio-controlled areas. Under the judgement criteria for therapeutic effects according to the breast cancer handling agreement, CR, PR, NC and PD were noted in 1, 8, 5 and 1 cases, respectively, with a 60% rate of effectiveness. Judgement of effects by 201Tl-chloride scintigraphy showed some correlation with the histological judgement, with its apparent effectiveness. Examination of the remote results revealed 3-year survival rate of 83.3% and 3-year healthy survival rate of 66.7% for the primary cases. Two of the 3 recurrent cases died at 2 and 11 post-infusional months, respectively, but 1 showing CR is still alive 4 years and 10 months, post infusionally.