Alterations in Trp metabolome in mice with syngeneic colon cancer tumors. (A) Average diet intake in grams was measured in 4 age-matched female mice subjected to different Trp diets over 4 days. The y-axis denotes the diet intake per day per mouse. Error bars represent SEM. (B-E) Average levels of Trp metabolites in 4 to 5 mice per group are shown. Error bars represent SEM. ANOVA was performed to compare all the groups. P = .0006 (Trp levels ANOVA); P = .0017 (Kyn ANOVA); P = .0147 (kynurenic acid ANOVA); indoxyl sulfate ANOVA was not significant. Student t test was performed to compare individual groups. For kynurenic acid, in the nontumor group, P = .0631 (between normal and high Trp groups); P = .0778 (between zero and high Trp groups). No significant differences were noted between different diets in the tumor groups. (F) A linear correlation of normalized clot weights with Kyn levels.