Specifically, the JAK2 region was amplified in 2/25 NKTCL cases (Fig. 2b, Supplementary Fig. 3b), with the copy gain spanning also CD274 (PD-L1) and PDCD1LG2 (PD-L2) in one case. This evidence concerns the gene JAK2 and extranodal nasal NK/T cell lymphoma.