MMP can be secreted into the blood stream; hence, it is assumed that MMP levels in the blood could serve as a biological marker for disease onset, progression, and monitoring in different cancers.[9-11] MMP9 expression in the salivary gland tissue was evaluated[7-8] but their serum level in the salivary gland tumors was not studied. The gene discussed is MMP9; the disease is tumor of salivary gland.