In terms of EMT-TFs, the immunoreactivity of Slug (15.6% vs. 42.6%, p = 0.005), Twist (23.6% vs. 45.9%, p = 0.010), and ZEB1 (15.0% vs. 55.9%, p = 0.002) was significantly increased in BM compared with lung adenocarcinoma (Table 2), and direct proportion was found in the linear correlation of these markers (Figure 3); this finding indicated that the expression of these three EMT-TFs was increased in BM. Here, SNAI2 is linked to lung adenocarcinoma.