KIT and mastocytosis: Heritability associated with germline mutations of KIT is extremely rare in mastocytosis, and these germline KIT mutations occur in different gene regions such as N822I, F522C, K509I, S451C, R634W, Del 419, A533D, S476I, among others [17,29,30,31,32,33,34,35,36,37,38,39,40].