Folate Receptor Expression and Folate Receptor Targeted Chemotherapy in Cisplatin-sensitive and – resistant Human cancer cell lines Marverti G.a, Pirondi S.a, MarracciniC.a, Frassineti C.a, Helleman J.b, Berns E.M.J.J. b, and Costi, M.P. cThe 4th International Symposium on Folate Receptors and Transporters Cozumel, Mexico October 7 - 11, 2012