Radioimmunotherapy Plus Peripheral Stem Cell Transplantation in Treating Patients With Stage IV Breast Cancer

DISEASE CHARACTERISTICS: Histologically or cytologically proven stage IV breast cancer Measurable disease after firstline or greater chemotherapy Evidence of CEA expression by: Serum CEA at least 10 ng/mL OR Positive immunostaining of primary or metastatic tumors with a CEA-specific antibody Positive imaging of at least 1 confirmed tumor by pre-therapy indium In 111 monoclonal antibody MN-14 No brain metastases Bone marrow biopsy prior to stem cell mobilization required to assess cellularity and tumor involvement Cellularity greater than 60% of normal Tumor involvement less than 25% Chromosome analysis of bone marrow aspirate (optional) No brain metastases Hormone receptor status: Not specified

PATIENT CHARACTERISTICS: Age: 18 and over Sex: Not specified Menopausal status: Not specified Performance status: Karnofsky 70-100% OR ECOG 0-2 Life expectancy: At least 3 months Hematopoietic: WBC at least 3,000/mm3 Granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 2 mg/dL AST less than 2 times upper limit of normal (ULN) Renal: Creatinine less than 1.5 times ULN Cardiovascular: Cardiac ejection fraction greater than 50% by MUGA Pulmonary: DLCO greater than 70% of predicted FVC and FEV1 greater than 70% of predicted Other: Not pregnant Negative pregnancy test Fertile patients must use effective contraception No severe anorexia, nausea or vomiting, or urinary incontinence No other significant concurrent medical problem including severe psychiatric, epileptic, or diabetic disease No prisoners If received prior chimeric or humanized antibody (e.g., trastuzumab (Herceptin)), must not have allergy to yttrium Y 90 monoclonal antibody MN-14

PRIOR CONCURRENT THERAPY: Biologic therapy: No prior peripheral blood stem cell rescue Chemotherapy: See Disease Characteristics At least 1 course of prior chemotherapy At least 4 weeks since prior chemotherapy No prior high-dose chemotherapy Endocrine therapy: Not specified Radiotherapy: At least 4 weeks since prior radiotherapy No prior radiotherapy to more than 30% of red bone marrow Surgery: At least 4 weeks since prior major surgery