SAEC, the adenocarcinoma cell line A549 and the squamous cell line NCI-H226 express protein for α7 (Figure 7), whereas the adenocarcinoma cell line NCI-H322, the carcinoid cell line NCI-H727, the squamous cell lines NCI-H520 and NCI-H2170 did not express protein for the α7 nicotinic acetylcholine receptor (Figure 7). This evidence concerns the gene CHRNA7 and carcinoid tumor.