In the PTC area, Tg, Galectin-3, and CK19 are positive, while CT is negative; in the MTC area, most patients have positive CT and CEA, and neuroendocrine cancer markers such as Syn, CgA, and CD56 are mostly positive, while TG is generally negative. Here, CEACAM5 is linked to medullary thyroid gland carcinoma.