Last, we reanalyzed available scRNA-Seq data from 2 cohorts of SCLC human tumors (53, 54) and found additional evidence of intratumor heterogeneity of NOTCH1 expression in both ASCL1- and NEUROD1-enriched tumors (Supplemental Figure 13, A–C). The gene discussed is NEUROD1; the disease is small cell lung carcinoma.