CTNNB1 and CDH1 were expressed in 90% (54/60) of small cell lung cancer cells (Fig. 1a), in which weak expression (score between 10 and 20) was 11.11%, moderate (score between 20 and 100) was 70.37% and strong (score between 100 and 300) was 18.52% (Additional file 2: Figure S1). This evidence concerns the gene CTNNB1 and small cell lung carcinoma.