ABCB1 and colonic neoplasm: Several carotenoids (antheraxanthin, fetoxanthin, lutein, luteoxanthin, neoxanthin, violaxanthin, violeoxanthin and β-cryptoxanthin) were evaluated for their ability to inhibit efflux activity in colon cancer Colo 320 cell line expressing both ABCB1 and lung resistance protein (LRP) [83].