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  • Title: Expression of the breast cancer associated gene pS2 and the pancreatic spasmolytic polypeptide gene (hSP) in diffuse type of stomach carcinoma.
    Author: Theisinger B, Welter C, Seitz G, Rio MC, Lathe R, Chambon P, Blin N.
    Journal: Eur J Cancer; 1991; 27(6):770-3. PubMed ID: 1829922.
    Abstract:
    Expression of the pancreatic spasmolytic peptide (hSP) gene and pS2 (a gene isolated from oestrogen-induced breast carcinoma cells) were analysed in 36 samples of human stomach carcinoma. 17 tumours were investigated at the RNA level (by northern blots) as well as at the gene product level (by immunochemistry). Since pS2 had been shown to be expressed in normal stomach mucosa its activity in carcinoma samples was expected. Surprisingly, strong pS2 immunoreactivity was noted in the diffuse carcinoma type, whereas the intestinal type displayed weak reactivity. The tumour samples showing strong immunostaining expressed the regular 0.6 kb pS2 RNA band and weak staining was paralleled by aberrant transcripts. Additionally, only in tumour samples with regular pS2 transcription was the typical 0.7 kb hSP RNA band seen; samples with aberrant pS2 bands did not express hSP at all. This is the first demonstration of hSP gene activity in a human tumour.
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