Other studies reported inverse correlations of serum ghrelin levels and risk of cancer (De Martel et al. 2007, Murphy et al. 2011, 2012, Sadjadi et al. 2013), as well as decreased serum ghrelin levels in cancer patients vs controls (D’Onghia et al. 2007, Lin & Yin 2007, Moschovi et al. 2008, Legakis et al. 2009, Kemik et al. 2010, 2012, Roth et al. 2011, Zub-Pokrowiecka et al. 2011) (Table 1). The gene discussed is GHRL; the disease is cancer.