SOX2 and neoplasm: Analysis based on the Spearman correlation coefficient indicated a very weak positive correlation between NSDHL and SOX2 expression in patient tumor tissues (n = 998, r = 0.089, P = 0.005; Fig. 6A), whereas a negative correlation was found between NSDHL and NANOG expression (n = 998, r = -0.038, P = 0.24; Fig. 6B).