B2M and diffuse large B-cell lymphoma: After removing causal SNPs, significant associations remained between β2M and DLBCL (OR: 1.946; 95% CI: 1.242-3.049; P = 3.68×10−3) and between β2M and FL (OR: 1.805; 95% CI: 1.096-2.972; P = 2.03×10−2).