IL-6 level was also found to be elevated in the striatum, CSF, and serum of PD patients in many clinical studies (Dursun et al., 2015; Lindqvist et al., 2012; Müller et al., 1998; Mogi et al., 1994; Blum-Degen et al., 1995; Tang et al., 2014; Gruden et al., 2012; Dobbs et al., 1999; Brodacki et al., 2008). The gene discussed is IL6; the disease is Parkinson disease.