HOTAIRM1 and Parkinson disease: Fan et al. showed that HOTAIRM1 was highly expressed in PD patients, and had potential value for PD diagnosis; moreover, HOTAIRM1 expression was also increased in 6-hydroxydopamine (6-OHDA)-stimulated SH-SY5Y cells, in vitro system used in the PD study, and reduced cell viability, suggesting the involvement of HOTAIRM1 in the pathogenesis of PD [14].