To this end, we examined the protein expression of ABCB1 in KB-V-1 cancer cells (Figure 3E) and ABCG2 in S1-M1-80 cancer cells (Figure 3F) after treating cells with increasing concentrations of TMP195 (0–5 μM) for 72 h, followed by immunoblotting as described in Section 4. This evidence concerns the gene ABCG2 and cancer.