PVT1 and posterior cortical atrophy: PVT1 exon 4A in the PCa samples was 2.3 times higher than in the RWPE1 cell (p value =1.418e-06), PVT1 exon 4B was 1.5 times higher (p value = 0.00052) while PVT1 exon 9 was 2.4 times higher (p value = 5.413e-06).