To better understand how the SMARCA4-containing SWI/SNF complex controls NE cell fate in SCLC, we performed ChIP-seq of SMARCA4 in four NE SCLC patient-derived xenografts (PDXs) with high levels of SMARCA4 (Fig. S5A) and no mutations in any of the SWI/SNF complex subunits (Fig. S5B). The gene discussed is SMARCA1; the disease is small cell lung carcinoma.