Factors significantly associated with MLNM are: CEA ≥ 5.0 ng/mL (P < 0.001), tumor size (P = 0.033), solid nodule (P < 0.001), tumor SUVmax ≥ 3.7 (P < 0.001), hilar LN SUVmax ≥ 2.0 (P < 0.001), central located tumor (P = 0.005). Here, CEACAM5 is linked to neoplasm.