Dr Dan Guerra reveals that serine protease inhibitors (Serpins) are endogenous proteins that block protease-mediated metastasis and cancer associated fibroblast activation in some tumor microenvironments but not all. The myriad 'labyrinth' interactions among cytokines , proteases, protease inhibitors and the dysregulation of the T-lymphocytic immune response obtains a confounding pharmacotherapeutic anisotropy. 

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