Notably, the enhanced expression of Tim‐1 resulted in increased IL‐10 production in TK cells but not in other B‐cell lymphoma lines, Raji and Granta 519 (Fig. 2A), suggesting that Tim‐1 augments IL‐10 expression in a PCNSL‐specific cell condition. Here, HAVCR1 is linked to B-cell non-Hodgkin lymphoma.