Clinical characteristics of 411 patients with breast cancer, who were seen between March of 1983 and February of 1993 at the Keimyung University Dongsan Hospital, were analysed ac- cording to their pathological classification. Those with incomplete medical records and with in- complete follow up were not included in this study. Pathological classification was made ac- cording the final pathological report at the time of biopsy or surgery. 1) Of 411 patients, 405 were female and six were male. The most common pathological type was invasive ductal carcinoma with 298 patients(73.58%), followed by medullary carcinoma (7.16%), lobular carcinoma(4.20%), Paget's disease(4.20%), mucinous carcinoma(3.21%), intraduc- tal carcinoma(2.72%), and other rare types. 2) Average age of the patients was 46.1 years and there was no significant difference in average ages among the different pathologic types except in the patients with secretory carcinoma. 3) The average duration of symptoms of the entire patients was seven months. 4) The average size of the tumors was 4.2 cm and there was no difference in the average sizes among the histologic types. 5) The hormone receptor was positive in 95 patients(53.4%) of 178 patients tested. In patients with invasive ductal carcinoma the positivity for the hormonal receptor was 54.9%. Nine of 10 patients with lobular carcinoma was positive for hormonal receptor but all of the seven patients with medullary carcinoma was hormone receptor negative. 6) Axillary lymph nodes were involved in 66.1% of the entire patients. Positive axillary nodes were found in 71.4% of patients with invasive ductal carcinoma, 76.5% with lobular carcinoma, 64.7% with Paget's disease and 55.2% with medullary carcinoma. 7) In the six male patients, invasive ductal carcinoma was found in three patients, intraductal carcinoma in one patient, papillary carcinoma in one patient, and hemangio- pericytoma in one patient. The patient with intraductal carcinoma was 39 years old but average age of the remaining 5 patients was 54.2% years.
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