TNFRSF1B and Lymphadenopathy: Intriguingly, serum levels of CXCL13 correlated positively with the lymphadenopathy, glandular, and pulmonary domains of the ESSDAI, while serum levels of CXCL13, TNF-R2, and CD48 correlated positively with the biological domain of the ESSDAI; and serum levels of TNF-R2 correlated with low uptake on salivary gland scintigraphy43.