EPCAM and posterior cortical atrophy: Interestingly, the efficacy of CTC isolation with Ficoll * (AUC = 0.79) was higher than that of CC-EpCAM and CC-PCa in cohort 1 and that of CC-EpCAM, SC and Ficoll ** in cohort 2 (AUC = 0.53, 0.67, 0.55, 0.73 and 0.67, respectively, Table 2).