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DOI: 10.1677/jme.0.0240033
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Journal of Molecular Endocrinology, Vol 24, Issue 1, 33-41
Copyright © 2000 by Society for Endocrinology

Articles

Human chorionic gonadotrophin-beta transcripts correlate with progesterone receptor values in breast carcinomas

T Reimer, D Koczan, H Muller, K Friese, A Krause, HJ Thiesen, and B Gerber


The pathophysiological role for the expression of human chorionic gonadotrophin (hCG) in malignant neoplasms is currently speculative. We investigated the overall expression of genes hCG-beta 5, 3, 8 and 7 in breast carcinoma (n=214), fibroadenoma (n=37) and macromastia (n=10) by quantitative reverse transcriptase-PCR. Eighty (37.4%) of the breast cancer samples revealed positive hCG-beta mRNA expression and the mean value was 67. 9 copies per 200 ng total RNA (range: 0-1743; 95% confidence interval (CI) for mean: 44-92). Fibroadenomas had more frequently detected (56.8%) and greater hCG-beta copy numbers (mean 86.9; range: 0-845; 95% CI for mean: 35-138). Macromastia probes yielded no positive hCG-beta mRNA. The hCG-beta mRNA expression was significantly different in the three histological subgroups (P=0. 006). Among breast carcinomas, a positive correlation was detected between hCG-beta mRNA copy numbers and progesterone receptor (PgR) values (P<0.001). No significant differences were seen regarding disease-free (P=0.87) and overall survival (P=0.20) depending on hCG-beta mRNA status. Finally, our findings do not support a role for hCG-beta in malignant transformation of human breast cells and indicate a possible involvement of hCG-beta in benign breast disease. The relationship with PgR expression may suggest that progestins regulate the expression of hCG in breast epithelial cells.


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