The efficacy of the combination chemoendocrine therapy CAUT against advanced and recurrent breast cancer was examined. One course of this therapy lasted 3 weeks and consisted of adriamycin (i.v.) at 30 mg/m2 on day 1, cyclophosphamide (p.o.) at 65 mg/m2 and UFT (p.o.) at 300 mg/m2 on days 1-14, and tamoxifen (p.o.) at 20 mg/body on days 1-21. Twenty patients were enrolled, of whom 19 were eligible including seven with advanced cancer and 12 with recurrent cancer. One patient achieved CR, ten PR, three NC, and five PD, for a response rate of 58% (95% CI: 29-87%). The response rates according to type of lesion were 73% (8/11) for the soft tissue, 38% (3/8) for the bone, 20% (1/5) for the lungs and pleura, and 50% (2/4) for the liver. Adverse events with a severity of grade 3 or more included a reduction in WBC in six patients (31.6%), a reduction in RBC in one (5.3%), alopecia in four (21.1%), and severe general fatigue in one (5.3%). One patient experiencing a grade 4 reduction in WBC, and one of five patients experiencing a grade 3 reduction with a fever, recovered after treatment with G-CSF. The other four patients recovered following suspension of administration. This therapy is considered useful, exhibiting a high response rate and relatively slight adverse effects.