TET2 and myelodysplastic syndrome: Consistently, the number of mutational events appears to be higher in MDS, MDS/MPN and primary AML patients harbouring TET2 mutations compared to those with WT TET2. However, this observation from patient exome analysis does not necessarily imply a direct role of TET2 mutations in promoting additional mutations, since other factors associated with patients with TET2 mutations might also contribute to this observation such as older ages, increased stem cell proliferation and/or longer average disease latency due to a preceding phase of clonal haematopoiesis.