Figure 6: A: PCA scores plot of non-invasive and invasive/metastatic gastric cancer patients. The scores plot differentiated between non-invasive and invasive/metastatic gastric cancers. Group 1 or 2 indicates non-invasive or invasive/metastatic gastric cancer patients, respectively. B: ROC (receiver operating characteristic) curves, AUC=0.982. AUC: area under the curve.