Thus, KIT D816V-mutated AHN cells have been found in 89% of SM associated with chronic myelomonocytic leukaemia (SM-CMML), while this would only occur in 20% of SM associated with myeloproliferative neoplasms (MPN) and 30% of SM associated with acute myeloblastic leukaemia (AML); in turn, the KIT mutation is almost systematically restricted to the MC compartment in patients with SM associated with lymphoid neoplasms [36]. Here, KIT is linked to systemic mastocytosis.