In our preliminary study, we also observed different levels of EF-Tu expression in some tumor cell lines, including high level EF-Tu expression in breast cancer cell line MCF7, leukemia cell line k562 and gastric cancer cell lines SGC-7901, MKN-45 and KatoIII, and low level EF-Tu expression in gastric cancer cell lines MKN-28 and MKN-74. This evidence concerns the gene EEF1A1 and breast carcinoma.