Garreto and colleagues [84] also revealed a significant increase in the levels of Matrix Metalloproteinase-9 (MMP9), Neutrophil Elastase (ELANE), Cathepsin G (CTSG), and Myeloblastin (PRTN3) in the saliva of patients with Sjögren’s syndrome compared to healthy controls. Here, CTSG is linked to Sjogren syndrome.