As shown in Figure 1A, four human esophageal carcinoma cell lines, including TE-1, Eca109, KYSE150 and KYSE510 revealed increased levels of Mcl-1 protein compare with an immortal non-tumorigenic keratinocyte HaCaT cell line [27], which was used as a normal control [36,37] for Mcl-1 expression. This evidence concerns the gene MCL1 and carcinoma of esophagus.