ABCG2 and breast carcinoma: Thus, the post-hypoxia/oxidative stress [SPm (hox)+/ABCG2+ CSCs of several cell lines that we previously characterized for the TS phenotype SPm (hox) enriched in EpCAM+/ABCG2+ CSCs], including oral cancer, breast cancer, and lung cancer, were infected with Mtb-m18b and BCG.