LCK and diffuse large B-cell lymphoma: The results showed a positive correlation between LCK expression and BCL6 (r = 0.56, P = 3.9E‐5), CD23 (r = 0.48, P = 0.00065), MUM1 (r = 0.42, P = 0.0034), and PAX5 (r = 0.26, P = 0.076) expression, which are very common markers for the pathological identification of DLBCL.