PGP and uterine corpus sarcoma: The half-sandwich Rh­(III)­(η5-C5Me5) complex of PHEN showed highstability in solution and exhibited significanttoxicity against thehuman uterine sarcoma MDR cancer cell line MES-SA/Dx5 (IC50 = 2 μM), with a selectivity ratio (SR) of 4, which was dependenton functional P-gp.