CHRNA7 and small cell lung carcinoma: In addition, α‐bungarotoxin (α‐BTx), a selective α7 nAChR antagonist, disrupts metastatic progression in SCLC and NSCLC through inhibition of phosphorylation routes involved in metastasis, namely through proto‐oncogene tyrosine‐protein kinase Src and additional kinases about stimulation with NNK [65, 139, 140].