Semi-quantitative ST6GAL1 real-time PCR expression analysis was performed on 51 bladder cancer tissue samples including flat (n = 12 CIS), papillary non-invasive (n = 13 pTa), and muscle-invasive (n=26 pT2-4) bladder tumor samples (Figure 1A). The gene discussed is ST6GAL1; the disease is urinary bladder carcinoma.