Conversely, in another study comparing iRBD, individuals with hyposmia, and GBA1-NMC and LRRK2-NMC, a lower mean SBR was observed in iRBD compared with hyposmia and NMC cohorts, and no differences were found between GBA1-NMC and LRRK2-NMC [77]. Here, GBA1 is linked to nut midline carcinoma.