<a href=http://levitrax.pics>10 mg bayer acheter levitra</a> Paracrine signaling is likely to be the major mechanism through which stromal cells affect tumor cell function, as stromal cells secrete a variety of signaling molecules, including hormones and inflammatory cytokines, many of which have been shown to be associated with tumor progression in breast cancer patients, where they impinge on the function and phenotype of cancer epithelial cells
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