The statistically analyzed results showed that the positive staining area percentage (PSAP) of β-catenin and MMP7 in 42 cases of NPC tissues was 13.4 (9.23, 18.52) and 19.6 (11.44, 26.75), respectively, which were higher than those of 4.65 (2.57, 7.19) and 0.8 (0.32, 1.95) in 9 cases of CP tissues, with the significant differences (z values −3.83 and −4.59, P < 0.01, respectively) (Table S4). This evidence concerns the gene MMP7 and nasopharyngeal carcinoma.