To date, a 89Zr-labeled anti-LAG-3 antibody (REGN3767) has been developed and is under clinical evaluation to image LAG-3 expression in patients with diffuse large B cell lymphoma (NCT04566978) and patients with solid cancer that are treated with the PD-1 blocking mAb, Cemiplimab (NCT04706715). This evidence concerns the gene LAG3 and diffuse large B-cell lymphoma.