CD274 and diffuse large B-cell lymphoma: We also found a relative loss of the PDL1/2 region to be most prevalent in extranodal DLBCL of the stomach (2/7; 29%) and testis (2/7; 29%), followed in decreasing order by ENT (5/25; 20%), skin (3/16; 19%), CNS (2/23; 9%), and finally PMBL (1/12; 8%).