In addition, associations between serum IGF-1 levels and cognitive function in patients with growth hormone deficiency (Webb et al. 2012; Licht et al. 2014), infantile spasms (Riikonen et al. 2010), Parkinson’s disease (Pellecchia et al. 2013), and delirium (Adamis and Meagher 2011) were reported. The gene discussed is IGF1; the disease is infantile spasms.