TCF7 and posterior cortical atrophy: Another way of viewing this result is that Ki67+ B and TCF1+ T cells were highly enriched in BICs having ICAT values less than its 1st quartile (Q1 = 13.7) (Extended Data Fig. 3d–e), and thus, segregation on ICAT interquartile value alone (<Q1 = 13.7 and >Q3 = 32.4) was effective at discriminating BICs with proliferating B cells and stem-like T cells in both HGG and LGG PCa.