GNAS and neoplasm: Four (Kanda et al. 2013; Kuboki et al. 2015; Singhi et al. 2014; Wu et al. 2011b) and three (Kuboki et al. 2015; Singhi et al. 2014; Wada et al. 2004) studies presented mean tumour size with SD or p value according to KRAS or GNAS mutation, respectively.