SNHG14 and diffuse large B-cell lymphoma: SNHG14 inhibits CTL activity and regulates DLBCL proliferation and apoptosis via miR‐152‐3p. SNHG14 promotes DLBCL progression via its sequestration of miR‐152‐3p, preventing its inhibition of the PD‐1/PD‐L1 checkpoint