A study with 426 adult T cell leukemia/lymphoma (ATL) cases associated with human T cell leukemia virus type-1 (HTLV-1) infection shows that PI3KCD mutation is also observed in 9 of 370 (2.4%) cases besides the highly enriched for TCR/NF/kB signaling, T cell trafficking and other T cell-related pathways [324]. Here, NFKB1 is linked to adult T-cell leukemia/lymphoma.