ASCL1 and small cell lung carcinoma: The log2-transformed expression levels of miR-139-5p showed a strong correlation with those of NEUROD1 (r = 0.77) in contrast with the negative association with those of ASCL1 (r = -0.78), suggesting that miR-139-5p could be a subtype-defining miRNA that distinguishes between SCLC-A and SCLC-N (Fig. 4C).