CXCL1 and synovial sarcoma: In addition to these chemokines and their receptors, salivary gland ductal cells and inflammatory cells of SS patients showed reduced expression of CCL28 mRNA and increased expression of CCL21/CCR7, CCL5/CCR1 and CXCL1/CXCR2, accompanied by more severe histopathologic damage (72, 73).