BCL2 and cancer: In a subsequent study, the group synthesized a series of other carbazole based benzimidazoles for targeting G4 structures in oncogene promoter regions.[41c] All the ligands have been found to stabilize the G4 DNA of c‐MYC, c‐KIT1, c‐KIT2, VEGF and BCL2 gene promoters and repress the expression of the oncogenes in cancer cells but they fail to discriminate among diverse G4 topologies.