TGM2 and squamous cell carcinoma: A comparative analysis of the TGase 2 expression and clinicopathologic parameters in the 429 NSCLC cases (Table 2) showed that TGase 2 levels were significantly higher in adenocarcinoma than in squamous cell carcinoma (p < 0.001), in females than in males (p < 0.001), and in nonsmokers than in smokers (p < 0.001).