The occurrence of NRAS mutations has been reported among adult (9–12%) and childhood AML (12–13%) but KRAS mutations appeared to be more prevalent in adult AML than childhood AML (12 vs. 3–7%) (Mardis et al., 2009; Cancer Genome Atlas Research, 2013; Liang et al., 2013; Kao et al., 2014; Shiba et al., 2016). The gene discussed is NRAS; the disease is acute myeloid leukemia.