The author had become to suspect on the utility value of the histological classifications of the breast cancer, now accepted in the world, everytime by the patho-histological examination of the breast excised surgically due to cancer, and then had attempted to appreciate on their appropriate use.
There are many histological classifications of the breast cancer designed by those authors as Kaufmann-Gruber, Geschickter, Willis, Stewart, Kuzuma, Ackerman, Arbertini etc., with each own criteria. Recently WHO international reference center for mammary tumors published another one in 1964. In those classification tables the classification terms are
selected usually corresponding to the histological variants of the breast cancer.
The author has been convinced that a classification term of breast cancer should be responced to a species of cancer.
On this viewpoint the author studied on the histological classifications designed by those authors as described above, and noticed, for example, that the classification terms listed in the Stewart's classification table or the terms listed as special histological variants in the WHO classification are mostly corresponded to the histological variants of the breast cancer.
The tranceferences between the variant histological pictures observed in the breast cancer are often noticed. The histological pictures of the breast cancer are influenced significantly by the conditions surrounding cancer tissue as cystic dilatation of mammary ducts, lobular or ductular hyperplasia, interstitial hyaline fibrosis etc., when cancer tissue pro-
liferate within them. These facts signified that the histological classification terms of the breast cancer, above described, don't represent the species of the breast cancer but merely the variances of histological pictures. The author concluded that the histological cla-
ssifications of the breast cancer, now popular in the world, should not be used for representation of the breast cancer but for description of the histological variances of it.
The hospital pathologists, who have been examined pathologically the excised breast due to cancer routinely, shall have to be expected for the reports such as the diagnosis of cancer, its invasiveness and metastasis, and the suggestions upon the sensitivity of the breast cancer cells for radiation or antineoplastic drugs. For those purposes the author
designed a practical rule of the pathological examination of the excised breast and of the description. The author offered a opinion that the further studies on the sensitivity of breast cancer cells for radiation or antineoplastic drugs and on the host resistance should be encouraged strongly.
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