ASCL1 and small cell lung carcinoma: After analysis of published ChIP‐sequencing datasets, we identified that specific binding sites for both NeuroD1 and ASCL‐1 are enriched upstream of the netrin‐3 gene promoter in SCLC cell lines (Robinson et al, 2011; Borromeo et al, 2016; Huang et al, 2018; Upton et al, 2020) (Figs 5A and EV4A and B).