Pancreatic cancer as a model: Inflammatory mediators, acute-phase response, and cancer cachexia

Patients with pancreatic cancer frequently develop the syndrome of cancer c achexia. Pro-inflammatory cytokines have been strongly implicated in the pa thogenesis of this syndrome. In patients with pancreatic cancer an acute-ph ase response (an index of pro-inflammatory cytokine activity) is associated with accelerated weight loss, hypermetabolism, anorexia, and a shortened d uration of survival. However, little is known about the primary significanc e of the acute-phase response in terms of altered hepatic export protein sy nthesis rates and its potential impact on the body's nitrogen economy. In a recent series of studies on weight-losing pancreatic cancer patients with hypoalbuminemia we have demonstrated albumin synthesis to be unaltered wher eas fibrinogen synthesis is increased two- to threefold compared with healt hy controls. Because of the mismatch in amino acid composition between the body's main labile amino acid reserve (skeletal muscle) and that of acute-p hase proteins, these results lend support to the concept that in pancreatic cancer the reprioritization of body protein metabolism during an acute-pha se response may well be a significant factor in the loss of lean tissue in these patients.