CEACAM5 and neoplasm: However, no significant differences in plasma exsomal miR-139-3p levels were observed for patients with different tumor locations (Fig. 3A, Left vs. Right, P = 0.167), different tumor sizes (Fig. 3B, tumor size < 2 cm vs. tumor size ≥ 2 cm, P = 0.124), different CEA levels (Fig. 3D, low-CEA vs. high-CEA, P = 0.134), and different nerve infiltration (Fig. 3E, negative nerve infiltration vs. positive nerve infiltration, P = 0.326).