IDH1 and angioimmunoblastic T-cell lymphoma: In myeloid neoplasms, TET2 and IDH1/2 mutations are usually mutually exclusive (Figueroa et al., 2010; Shih et al., 2015; Inoue et al., 2016), but they are often paired together in Angioimmunoblastic T-cell Lymphoma (AITL) (Wang et al., 2015; Cortes and Palomero, 2020).