CXCL13 serum levels were positively associated with the saliva ones (r=0.368, p=0.014) (Figure 2C), and were correlated with the number of infiltrating CXCL13-positive cells per tissue area in the MSG lesions (r=0.534, p=0.011) (Figure 2D), a correlation that was further strengthened after excluding from the analysis pSS patients with NHL (r=0.797, p=0.0007). This evidence concerns the gene CXCL13 and non-Hodgkin lymphoma.