In a comprehensive study on different lymphomas, PD-L1 was more often expressed than PD-L2 in lymphomas, while certain lymphomas showed the expression of PD-L2 but not PD-L1 in some cases of DLBCL and primary mediastinal B cell lymphoma [36]. The gene discussed is PDCD1LG2; the disease is B-cell non-Hodgkin lymphoma.