CDKN2C and nasopharyngeal carcinoma: Among the 44 NPC specimens, a significantly positive correlation calculated by the Pearson χ2 test was observed between the two proteins (r = 0.51, p < 0.001, Supplementary Table 6), the percentage of high p18 IHC scores in specimens having high expression was 68.42% (Fig. 7i, j).