TET2 and myeloproliferative neoplasm: Similarly, Jankowska et al. described that LOH of chromosome 4q (where TET2 gene is located) was frequent in CMML and in secondary AML arising from these cases; however, it was absent in refractory anemia with ring sideroblasts and thrombocytosis (current MDS/MPN-RS-T) and aCML patients [47].