Tumor samples from 80 patients with breast cancer (43 primary, 37 metastatic) were analyzed for ploidy and proliferative activity using DNA flow cytometry. Sixty-one tumors (40 primary, 21 metastatic) were also analyzed for estrogen receptor content. Eighty-five percent of all tumors had an abnormal DNA content. The majority of tumors were hyperdiploid (65… (More)