ABCB1 and colon adenocarcinoma: Our previous studies have demonstrated that the selenoanhydride 1 and selected selenoesters 2–11 (Table 1) have shown potent anticancer activity against ATP-Binding cassette sub-family B member 1 (ABCB1)-overexpressing MDR mouse T-lymphoma cells and MDR colon adenocarcinoma cells [7,8].