OR51E2 and posterior cortical atrophy: In 2017, Ferreira de Souza et al. analyzing plasma mRNA and miRNA of 102 untreated patients with PCa and 50 healthy subjects, identified differentially expressed OR51E2 (olfactory receptor, family 51, subfamily E, member 2) and SIM2 (single-minded 2) mRNAa, miR-200b and miR-200c.