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In page Cachexia:

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Although many different tissues and cell types may be responsible for the increase in circulating cytokines, evidence indicates tumors themselves are an important source of factors that may promote cachexia in cancer. Tumor-derived molecules such as lipid mobilizing factor, proteolysis-inducing factor, and mitochondrial uncoupling proteins may induce protein degradation and contribute to cachexia.[3] Uncontrolled inflammation in cachexia can lead to an elevated resting metabolic rate, further increasing the demands for protein and energy sources.[2]