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PubMed1973

[Breast sarcoma].

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Adenofibroma↗
PubMed1979

Synergism of diethylstilbestrol and radiation in mammary carcinogenesis in female F344 rats.

One compressed 20-mg pellet containing cholesterol only or cholesterol mixed with 0.98, 1.6, 2.6, or 3.9 mg of diethylstilbestrol (DES) was implanted into each of 203 female F344 rats. Two days later, half the animals in each group were exposed to 150 R of X-rays, and the other half were sham irradiated. The rats were maintained until 350 days post implantation. Mortality increased with the higher doses of DES, with or without X-rays. DES at all dose levels, with or without X-rays, produced pituitary tumors and pyometritis. Only rats that received both DES and X-rays had mammary adenocarcinomas (AC). A synergistic AC response was found in the group that received 2.6 mg DES plus X-rays. Synergism was defined as a significantly greater incidence of rats with mammary neoplasia resulting from DES plus X-ray treatment when compared to the summed incidence from comparable individual treatments. For all other groups of rats that received both treatments, synergism was detected only when their data were combined. Synergism was not detected among rats that had fibroadenomas (FA). Both types of neoplasms were independent phenomena because no significant relationship was found between the incidences of FA and AC.

Adenocarcinoma↗
PubMed1973

Isoantigens A, B and H in benign and malignant lesions of breast.

Eighty-five specimens of breast tissue were grouped and investigated by the technic of mixed cell agglutination reation (MCAR) for studying isoantigens A, B and H (O). MCAR was found to be strongly positive at the epithelium of acini in all the 25 subjects with benign lesions (10 fibroadenomas, 10 cystic mastitis and 5 gynecomastias). On the other hand, all the subjects with diagnosis of primary carcinomas in breast (45 subjects) and their metastases (15 subjects) were found to be uniformly negative for any agglutination reaction. In view of these findings, it seemed that the isoantigens in primary and metastatic malignancies of breast are always lost, while in the benign lesions isoantigens are always present. Although the exact mechanism is not understood, it seems that, in malignancies with a glandular differentiation, some differences exist when these are compared to malignancies with a squamous differentiation. The various possibilities are discussed in the light of previous studies.

ABO Blood-Group System↗