AXL and prostate adenocarcinoma: Analysis of TCGA-generated prostate adenocarcinoma data (MSKCC, Cancer Cell 2010) [21] revealed that Slug expression was significantly correlated with Axl expression (n = 150, r = 0.60, P < 0.00001) (Supplementary Figure S3D) when the correlation was analyzed by calculating Pearson's correlation coefficient (r).