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Cachexia is responsible for nearly 20% of all cancer‑related deaths, yet effective therapies to prevent or treat the disease are lacking. Clinical studies have shown that male patients lose weight at a faster rate than females. Additionally, an 'obesity paradox' may exist where excess adiposity may confer survival to patients with cancer cachexia. To further explore these phenomena, the aim of this study was to evaluate the role of changes of adipose tissue mass, sex status, and tumor mass on outcomes of male, female and ovariectomized (OVX) mice with C‑26 adenocarcinoma‑induced cachexia. We used EchoMRI to assess body composition and grip strength to measure muscle function. Body weights and food intake were measured daily. Mice were euthanized 19 days post‑-inoculation. Post‑necropsy, muscle fiber cross‑sectional areas were quantified and real‑time PCR was performed for genes relating to proteolysis. Survival curve, correlation and multiple linear regression analyses were performed to identify predictors of cachexia. Female and OVX tumor mice developed cachexia similarly to males, as evidenced by loss of skeletal and adipose masses, decreased grip strength, and increased proteolytic gene expression. Notably, female and OVX tumor mice had earlier onset of cachexia (≥5% weight loss) than male tumor mice. Larger tumor mass and lower adipose mass were the strongest predicting factors for increased severity of cachexia, regardless of sex or ovariectomy status. These results indicated that the impact of sex status may be subtle in comparison to the predictive effect of tumor and adipose mass in mice with C‑26‑induced cachexia.

Higher tumor mass and lower adipose mass are associated with colon‑26 adenocarcinoma‑induced cachexia in male, female and ovariectomized mice