TGFB1 and metastatic malignant neoplasm in the lymph nodes: In addition, the expression of exosomal TGF-β1 in patients with lymph node metastasis (LNM) was twice as high as that in patients without LNM, suggesting that the expression of exosomal TGF-β1 in patients with gastric adenocarcinoma was associated with pathological stage and LNM.