TET2 and T-cell non-Hodgkin lymphoma: Notably, TET2 is a highly recurrently mutated gene in clonal hematopoiesis of indeterminate potential (CHIP), a condition characterized by the age-related expansion of hematopoietic clones carrying mutations in genes involved in epigenetic regulation [19], such as additionally DNMT3A, which was also found to be mutated in two CAR+ T-cell lymphoma cases [13, 15].