Abstract
Ets transcription factors play a central role in invasion and metastasis through regulation of synthesis of proteolytic enzymes and angiogenic molecules. The objective of this study was to investigate the role of PEA3 in tumor progression of ovarian and breast carcinoma metastatic to effusions, and to evaluate the expression of Ets-2 and Erg in ovarian carcinoma. Ovarian (83 malignant effusions, 102 corresponding solid lesions) and breast (33 malignant effusions, 40 corresponding solid lesions) carcinomas were evaluated for expression of PEA3 using mRNA in situ Hybridization (ISH). Expression of Ets-2 and Erg mRNA was analyzed in 50 ovarian carcinoma effusions using the same method. PEA3 mRNA expression was comparable at all sites in ovarian carcinoma (44 out of 83; 53% of effusions, 48 out of 102; 47% of solid tumors). PEA3 mRNA expression in effusions correlated with mRNA expression of the previously studied alphav (P = 0.022), alpha6 (P < 0.001) and beta1 (P < 0.001) integrin subunits, the matrix metalloproteinase (MMP) inducer EMMPRIN (P = 0.015) and interleukin-8 (IL-8) (P = 0.033). Erg and Ets-2 mRNA was expressed in 15 out of 50 (30%) and 18 out of 50 (36%) effusions, respectively, and co-localized with PEA3 (P = 0.017 f...Continue Reading
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