Interestingly, neither Bcl-2 protein nor Mcl-1 protein could be detected in multiple types of cultured endothelial cells and there was negligible detection of the mRNA for Bcl-2 in RNAseq data from multiple endothelial cell types and much lower Bcl-2 reads in RNAseq data from KS tumors (Table 2) [38–41]. This evidence concerns the gene MCL1 and Kaposi's sarcoma.