ABCG2 and cancer: Moreover, EVs may be transferred from drug-resistant cancer cell to drug-sensitive counterparts and thus plays a role in the horizontal transfer of drug resistance in cancer cells by delivering specialized cargo which includes drug resistance-related proteins (P-gp, ABCG2, ABCA3, etc.), nucleic acids (mt DNA, mRNAs, miRNAs), onco-metabolites, antiapoptotic proteins [22, 23].