KRT5 and posterior cortical atrophy: Similarly, KRT5 (hsa_circ_0026457) has been shown to be involved in the inhibition of PCa stem cell invasion, migration and proliferation, as has KRT7 (hsa_circ_0026358), which has been identified along with FAM129A, MME and SOD2 as part of a four-gene androgen regulated panel (Thomas et al., 2016).