LTA4H and metastatic malignant neoplasm in the lymph nodes: Carolina Moretto Carnielli et al. [22] applied proteomics and found that the combination of leukotriene A4 hydrolase (LTA4H)-, collagen type VI alpha 1 chain (COL6A1)-, and cystatin B (CSTB)-specific peptides in saliva, together with lymph node metastasis, can be an indicator of the prognosis of OSCC.