[Histological classification and prognosis of mammary cancer-histological classification devised by the Japan Mammary Cancer Society and WHO classification].

Between 1966 and 1977, 427 patients with mammary cancer underwent surgery at the Shikoku Cancer Center Hospital. Using these subjects, the histological classification devised by the Japan Mammary Cancer Society was compared with the WHO classification. Since the WHO classification places 80.4% of all cases into the category of invasive duct carcinoma, the significance of the histological classification as a factor in predicting prognosis is reduced. Thus, some other subclassification is needed for practical application. We classified invasive duct carcinoma according to cellular atypism (CAT), structural atypism (SAT) and infiltration mode (INF), and examined their relationship to the 5-year survival rate; there was a positive correlation.