To characterize JAK-STAT pathway activation, we stained for pY-STAT3, pMAPK, and pAKT in AITL (n = 29), ALCL (n = 20) and PTCL-NOS (n = 12) patients and control lymph nodes (n = 4) using immunohistochemistry (Supplementary Figure S1). Here, STAT3 is linked to angioimmunoblastic T-cell lymphoma.