Inclusion Criteria

DISEASE CHARACTERISTICS:

- Histologically confirmed stage IV breast cancer that is unlikely to respond to
existing therapy and for which no curative therapy exists

- Failed prior standard therapy

- Measurable disease by MRI or CT scan

- Tumor must be at least 2 cm in the lymph nodes in the head, neck, axillary, inguinal,
or femoral areas and at least 0.5 cm in other locations

- Hormone receptor status:

- Not specified

PATIENT CHARACTERISTICS:

Age:

- 18 and over

Sex:

- Female

Menopausal Status:

- Not specified

Performance status:

- Karnofsky 60-100%

Life expectancy:

- At least 2 months

Hematopoietic:

- WBC at least 2,000/mm^3

- Platelet count at least 50,000/mm^3

Hepatic:

- Bilirubin no greater than 2.5 mg/dL

- SGOT/SGPT no greater than 5 times upper limit of normal

- No hepatic failure

Renal:

- Creatinine no greater than 2.5 mg/dL

- No renal failure

Cardiovascular:

- No chronic heart failure

- No uncontrolled hypertension

Pulmonary:

- No severe lung disease

Other:

- Not pregnant or nursing

- Fertile patients must use effective contraception during and for 4 weeks after study
participation

- No serious medical or psychiatric disorders

- No active infections

- No other serious concurrent disease

- No serious malabsorption syndromes

PRIOR CONCURRENT THERAPY:

Biologic therapy:

- Recovered from prior immunotherapy

- At least 4 weeks since prior immunotherapy, except in patients with disease
progression during or after initial therapy

Chemotherapy:

- Recovered from prior chemotherapy

- At least 4 weeks since prior chemotherapy (6 weeks for nitrosoureas), except in
patients with disease progression during or after initial therapy

Endocrine therapy:

- Recovered from prior hormonal therapy

- At least 12 weeks since prior hormonal therapy, except in patients with disease
progression during and after initial therapy

- Concurrent corticosteroids for peritumoral edema allowed

Radiotherapy:

- At least 8 weeks since prior radiotherapy and recovered

- Patients with multiple tumors who have received radiotherapy to some, but not all,
tumors may be admitted earlier than 8 weeks

Surgery:

- Recovered from any prior surgery

- No prior extensive stomach or intestinal surgery

Other:

- Prior cytodifferentiating agents allowed

- No prior antineoplaston therapy

- No other concurrent therapy for metastatic breast cancer