To further analyze the co-expression pattern between the AS/ND-LCSS and ASCL1/NEUORD1, we performed unsupervised hierarchical clustering on pairwise Pearson correlations for these genes in three different transcriptome datasets (SCLC cell line microarray5, 2013 Sato SCLC33, and 2015 George SCLC16). Here, ASCL1 is linked to small cell lung carcinoma.