Chronic inflammatory responses such as the release of interleukin-1 (IL-1), interleukin-6 (IL-6), tumor-necrosis factor-alpha (TNF-α), all characteristic for PD (Ebersole and Cappelli, 2000), might be one of the etiological causes of PK (Wu et al., 2016). Here, IL6 is linked to Parkinson disease.