Forest plot showing significant causal effects between gut microbiota, inflammatory cytokines, and DLBCL from the IVW analysis. (A) Causal effects of 4 gut microbial genera on DLBCL. (B) Causal effects of DLBCL on 20 gut microbial taxa. (C) Causal effects of 4 inflammatory cytokines on DLBCL. nsnp, number of single nucleotide polymorphism; pval, P value.