ANC >/= 1.5 x 10^9/L, PLT >/= 100 x 10^9/L; bilirubin </= 1.5 x upper limit of normal (ULN), AST and ALT </= 2.5 x ULN; creatinine </= 1.5 ULN Accessible for repeat dosing and follow-up. Patients must practice effective contraceptive measures throughout the study. Provide written informed consent.