PTBP1 and cancer: PTBP1 could be quantified in all samples, ranging from 2.7–21.2 fmol/3 μg in the tumor samples (median 12.7 ± 7.2 fmol/3 μg) and 3.7–9.1 fmol/3 μg in the controls (median 7.4 ± 2.4 fmol/3 μg), showing no clear trend of regulation between cancer and control tissue.