“…In cross-sectional analyses of GBA mutations in PD patients, earlier disease onset, increased cognitive impairment, a greater family history of PD, and more frequent pain were reported in patients with mutations, compared with no mutations (Chahine et al, 2013;Clark et al, 2007;Gan-Or et al, 2008;Kresojevic et al, 2015;Lwin et al, 2004;Malec-Litwinowicz et al, 2014;Mitsui et al, 2009;Neumann et al, 2009;Nichols et al, 2009;Seto-Salvia et al, 2012;Sidransky et al, 2009;Swan and SaundersPullman, 2013;Wang et al, 2012). Recently, a few prospective studies have investigated clinical features of PD with GBA and showed a more rapid progression of motor impairment and cognitive decline in GBA mutation cases than in PD controls (Beavan et al, 2015;Brockmann et al, 2015;Winder-Rhodes et al, 2013).…”