MPO and breast cancer: Examples of diseases that can reliably be diagnosed through salivary analysis are pancreatic (miR-3679-5p and miR-940) [15], lung (cytokines IL1RN, IL1B, CXCL10) [22], and breast cancers (phenylalanine, tryptophan) [23], as well as myocardial infarction (C-reactive protein, myoglobin, and myeloperoxidase) [24].