These markers include FAT1 mutations, CD28 mutations in AITL, CDKN2A deletion in PTCL‐NOS, GATA‐3 expression, and TP63 structural abnormalities in ALK–ALCL (Table 5).24, 25, 26, 27, 28, 29, 30. Here, CD28 is linked to anaplastic large cell lymphoma.