12. Study participants, except those with Gilbert's Syndrome, must have adequate hepatic function as evidenced by serum total bilirubin ≤ 1.5 x ULN and AST/ALT levels ≤ 2.5 x ULN for the reference laboratory. If the study participant has known hepatic metastatic disease then AST/ALT should be ≤ 5.0 x ULN.