Fig. 3
From: Tissue metabolic profiling of human gastric cancer assessed by 1H NMR
Metabolic profiling between different stages of gastric cancer tissues and normal controls. a OPLS-DA scores plots based on each stages of gastric cancer tissues and normal controls. b Statistical validation of the corresponding PLS-DA models using permutation analysis (200 times). R2 is the explained variance, and Q2 is the predictive ability of the model. c Color map showed the significance of metabolite variations between the classes. Peaks in the positive direction indicated the increased metabolites in gastric cancer tissues. Decreased metabolites in gastric cancer tissues were presented as peaks in the negative direction. d ROC analysis was performed using the Y-predicted value determined by the OPLS-DA model between the classes