In the blood tests of some laryngeal cancer patients, an increase in the CEA index may be observed, but most laryngeal cancer patients do not exhibit abnormal CEA levels. This is because laryngeal cancer is a common malignant tumor in the head and neck region, and currently, there are no specific tumor markers clinically for laryngeal cancer. CEA, also known as carcinoembryonic antigen, is a tumor marker that is most often elevated in the bodies of patients with malignant tumors. Clinically, an increase in the CEA level is commonly seen in malignant tumors of the gastrointestinal tract, thoracic malignancies, malignancies in the female urogenital system, and some tumors in the male urogenital system. However, in patients with head and neck malignancies, this marker is not commonly elevated.