ABCG2 and cancer: In addition to the above DEPs, in Hela cells, we also found significant changes in many members of the ATP-binding cassette (ABC) transporters which make cancer cells resistant to chemotherapy agents [39], such as ABCB10, ABCB7, ABCD1, ABCE1, ABCF1, ABCF2, ABCF3 and ABCG2, and only ABCF1, ABCF2 and ABCF3 were detected in 293 T cells.