ST6GALNAC1 and posterior cortical atrophy: Closer inspection of both the Grasso and Taylor datasets revealed a dynamic switch in the expression pattern of ST6GalNAc1. A comparison of ST6GalNAc1 expression in primary and metastatic prostate cancer shows that ST6GalNAc1 expression strikingly decreases in metastatic PCa cells (Figure 6A, 6B).