QCR2 protein is upregulated in seven different types of human cancers. (a–g) The protein expression of QCR2 in normal/benign and malignant tissues was assessed by IHC using a tissue microarray consisting of various normal and malignant tissues (*p < .05, **p < .01, ***p < .001, student's t-test). Left: scot graph showing the statistical results; right: representative IHC images (100×, scale bar = 200 μm, 400×, scale bar = 50 μm). (h) QCR2 protein expression in pairs of tumors and adjacent noncancerous tissues derived from the esophagus, thyroid, cervix, and lungs.