OBJECTIVES: I. Determine variation in indium In 111 labeled 2IT-BAD monoclonal antibody 170 (111In-2IT-BAD-m170) pharmacokinetics before and with each therapy in patients with metastatic breast cancer. II. Determine each therapeutic dose of yttrium Y 90 labeled 2IT-BAD monoclonal antibody 170 (90Y-2IT-BAD-m170) based on the calculated radiation dosimetry for normal nonmarrow tissues from the pharmacokinetic study with 111In-2IT-BAD-m170 performed prior to each therapy course in these patients. III. Determine the maximum tolerated, nonmarrow, normal tissue dose (MTNTD) of 90Y-2IT-BAD-m170 for these patients when up to 3 courses with cyclosporine plus autologous peripheral stem cell support are given every 3 months. IV. Evaluate the safety of and tumor response to 111In/90Y-2IT-BAD-m170 therapy with cyclosporine and autologous peripheral stem cells at the MTNTD in these patients.