The overexpression of ABCG2 has been found to be related to acquired MDR in multiple types of cancers including breast cancer (Mao and Unadkat, 2015), non-small cell lung cancer (Yoh et al., 2004) and acute myelogenous leukemia (Ross et al., 2000). Here, ABCG2 is linked to non-small cell lung carcinoma.