TK1 and urinary bladder cancer: They investigated modulation in some proteins related to drugresistance in bladder cancer, as ATP binding cassette subfamily C member 2 (ABCC2),deoxycytidine kinase (DCK), thymidine kinase 1 (TK1), and thymidine kinase 2 (TK2).However, RSV may act by other mechanism since those proteins levels did not changeas expected.