We detected Tim‐3 expression on T cells (CD3+T cells, CD4+T cells, CD8+T cells) by flow cytometry, finding that Tim‐3 expression on CD3+T cells, CD4+T cells, and CD8+T cells in patients in the CLL group was relatively higher than that in HC group. Here, HAVCR2 is linked to B-cell chronic lymphocytic leukemia.