BCL2L1 and cancer: Analysis of five key BCL2 proteins that control the process of MOMP demonstrated a significant enrichment in anti-apoptotic BCL2 in immune cells when compared to cancerous epithelial cells or other stromal cells, while anti-apoptotic BCL(X)L and MCL1, although statistically enriched in cancer epithelial cells, were more homogenously distributed between the three cell types (Fig. 2C).