SLFN11 and small cell lung carcinoma: SLFN11 protein and mRNA expression levels were highly concordant across the 51 SCLC cell lines (Rho=0.81, P<0.0001; Supplementary Figure 4A) and bimodally distributed (based on bimodal index [BI]=2.76 and 3.01, respectively; Figure 2B and Supplementary Figure 4A).