TIMP metallopeptidase inhibitor 1 is also known as TIMP1, a tissue inhibitor of metalloproteinases, is a glycoprotein that is expressed from the several tissues of organisms. TIMP1 is a glycoprotein with a molecular mass of 28 kDa produced by a wide range of cell types. Tissue inhibitor matrix metalloproteinase 1 （TIMP1）, which belongs to TIMP gene family, is a natural inhibitor of the matrix metalloproteinases （MMPs）. Tissue inhibitor of metalloproteinases 1 （TIMP1） was the secreted factor with the strongest male-biased expression in patient-derived pancreatic tumors. Male-specific up-regulation of systemic TIMP1 was demonstrated in PC mouse models and patients. Using TIMP1-competent and TIMP1-deficient PC mouse models, we established a causal role of TIMP1 in determining shortened survival and increased liver metastasis in males.