CXXC1 and Parkinson disease: Although some genes initially selected as candidates for intrinsic disease markers, such as ETV4 and LIAS for AD, were not found to behave consistently in both datasets, others previously described as playing a role in AD and PD, such as RPH3A (Tan et al., 2014) and CXXC1 (Diao et al., 2013), were consistent.