PDCD1LG2 and systemic lupus erythematosus: A high proportion of PD-L2+ TILs was significantly more common in SLE-DLBCL compared to RA-DLBCL (92% vs. 24%, p < 0.001) and close to significantly more common compared to DLBCL controls (92% vs. 74% p = 0.057).