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Preclinical data suggest that medroxyprogesterone acetate (MPA) has both anti-metastatic and anti-angiogenic activity in the absence of hormone receptors (HR). This phase II trial assessed the activity of MPA alone or in combination with low-dose chemotherapy in patients with metastatic HR-negative breast cancer. Postmenopausal women with HR-negative disease were eligible if they had not received...
Plasminogen activator inhibitor type I (PAI-1) plays a central role in metastatic behavior by increasing cells' migratory capacities as shown in several tumoral cell lines. Moreover, in vivo high expression of this factor helps tumoral growth, both by its role in extracellular matrix remodeling and by favoring angiogenesis. High levels of PAI-1 are correlated with bad prognosis in several cancers,...
In mink lung CCL64 epithelial cells the rate of synthesis of plasminogen activator inhibitor type I (PAI-1) increases 10–100-fold within 3 h in response to 12-O-tetradecanoyl phorbol-13-acetate (PMA). The PAI-1 gene is regulated transcriptionally. Parallel studies of the time-courses of PAI-1 synthesis and secretion and of mRNA accumulation indicate that the amount of secreted PAI-1 produced by the...
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