APOC1 and metastatic malignant neoplasm in the lymph nodes: Taking into account the location of studied malignancy, saliva ApoC-1 is more relevant than serum and the recent work by Hirtz et al. on saliva revealed that ApoC-1 up-represented in OSCC without lymph node metastasis vs. OSCC_FREE and OSCC with lymph node metastasis [32].