CD40LG and diffuse large B-cell lymphoma: DLBCL patients showed a significantly higher prevalence of ACPA compared to healthy controls (3.5% versus 0.8%, p = 0.030; odds ratio [OR] 1.028, confidence interval [CI] 1.005–1.051), whereas all subtypes of RF such as IgM, IgA, and IgG, were equally prevalent in DLBCL patients and healthy controls: RF-IgM 22.8% versus 21.1%; RF-IgA 15.1% versus 12.6%; and RF-IgG 2.8% versus 1.8%.