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- W2007431327 abstract "In the study of 50 matched pairs of breast carcinoma and normal breast tissue, the activities of cysteine proteinases (CPs), cathepsin (Cat) B and Cat L in tumors were increased on average by 18.5-fold and 52.5-fold respectively. The differences in activity of cysteine proteinase inhibitors (CPIs) between tumor and control breast tissues was also observed: in approximately two thirds of carcinomas, lowered CPI activity was measured (group-I patients), while similar or higher tumor CPI activity was measured in the remaining samples (group-II patients). Relative increases in specific activity of Cat B and Cat L in group I were significantly higher than in group II. In group I more patients with histopathological tumor grade III and negative estrogen (ER) and progesterone receptor (PR) levels were found, but the metastatic involvement of regional lymph nodes was similar in both groups. A 2-year follow-up study showed a significant inverse correlation between disease-free survival and increased Cat L activity, but the differences in group I and group II patients were not significant in this short time interval. In 20 matched pairs of breast carcinoma and normal breast tissue, the mean activity of Cat D was 5.8-fold higher in tumors compared with controls. The hypothesis that elevated Cat D activity increased CP activity and/or lowered tumor CPI activity due to post-translational proteolytic modification appeared less likely, since no correlations between corresponding activities were observed. We suggested that lowered CPI might rather reflect changes in transcription of intracellular CPIs, the stefins. Immunoassay and Northern blot analysis showed that the average value of stefin A protein and mRNA content respectively in the majority of investigated breast carcinoma samples were lowered, suggesting the possible value of stefin A in diagnosis and/or prognosis of the disease." @default.
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- W2007431327 date "1992-01-02" @default.
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- W2007431327 title "Stefins and lysosomal cathepsins B, L and D in human breast carcinoma" @default.
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- W2007431327 doi "https://doi.org/10.1002/ijc.2910500109" @default.
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