CHAT and squamous cell carcinoma: As shown in Fig. 1 and compared with the expression in normal lung tissues, the mRNA expression of ChAT increased in nine out of the 18 lung tumors, including four adenocarcinomas, two squamous cell carcinomas, one atypical carcinoid, one small cell carcinoma and one mucoepidermoid carcinoma (T1, T2, T6, T8, T11, T12, T14, T16 and T17; Fig. 1).