TNFSF13B and Sjogren syndrome: B-cell-activating factor (BAFF), β2MG and myxovirus resistance protein A (MxA) were recently identified as biomarkers that correlate with European League Against Rheumatism (EULAR) Sjögren’s Syndrome Disease Activity Index (ESSDAI) scores [15–17], which is an objective method of evaluating clinical disease activity in clinical pSS research [1, 4, 18, 19].