DISEASE CHARACTERISTICS: Histologically documented breast adenocarcinoma Clinical or radiologic evidence of metastatic disease required Histologic confirmation recommended if evidence is equivocal Bidimensionally measurable disease required, i.e.: Lesion with clearly defined margins on physical exam or radiologic evaluation with 1 diameter greater than 0.5 cm Lytic bone metastases only if measurable on bone x-ray/survey Lesion previously irradiated only if subsequent measurable progression New measurable lesion in previously irradiated field The following are not considered measurable: Unidimensionally measurable lesions Palpable nodal disease not measurable on CT Masses with margins not clearly defined Lesions with both diameters less than 0.5 cm Bone disease other than lytic bone disease Pleural effusions or ascites Disease identified by bone scan only History of bilateral breast cancer allowed No brain metastases CT required if clinically indicated No meningeal carcinomatosis Hormone receptor status: Any status