From May 1962 to December 1964, 576 cases of breast tumores were treated in the National Cancer Center Hospital. Those of 66.1 percent were primary case and 33.9 percent were secondary case. Breast cancer was classified by TNM classification, and lymphnodes in these cases were examined histopathologically. Those of 56.5 percent of primary cases had lymphnode invasions. Post-operative irradiation were performed on 108 primary cases.
1) Number of lymphnode of dissected breast cancers were 2 to 76, average 14-20. Number of invated lymphnodes of the patients who received post-operative irradiation were as follows; negative: 2.6%, 1 to 2: 36.9%, 3 to 5:20.1%, 6 to 9:8.8%, more than 10: 31.6%.
2) The patients of outer side breast cancer and negative lymphnode invasions were not irradiated post-operatively, and there were 115 cases belonged to this group.
3) Six thousand R of post-operative irradiation was given by telecobalt unit, fixed field irradiation in the axillary and supra-, infra-clavicular regions and tangential rotation therapy in the internal mammarial region and thorax wall were applied.
4) Radiation hazard was not observed within a dose of 6000 R, except the slight degree of lung fibrosis which weighed to 12.7%, but special therapies were not required.
5) Recurrence or metastasis after irradiation were found in 20 cases of 104 postoperative cases, during the period of more than one year observation. Six cases from recurrent 20 cases were died in above mentioned period.
6) Eight cases were recurrent from the group of 137 non irradiated cases, namely 2/5 cases from 2 lymphnode invasions, 1/14 case from 1 lymphnode invasion, 5/118 cases from non lymphnods invasion. But 2 cases were received irradiation and chemotherapy, and 2 cases had been received biopsy.
7) Under the dosis of 5000 R many recurrent cases were found, and more than 6000 R some cases shows recurrent. These cases were many lymphnode invasions or questionable cases for radical operability.
It will be considered that post-operative irradiation of breast cancer with lymphnode invasions was useful but post-operative irradiation for the cases without lymphnodes invasions supposed to be undesirable because of the lower rate of recurrence.
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