- Adequate hepatic function as evidenced by serum total bilirubin less than 2X greater than the upper limit of normal (ULN) (less than3X ULN in patients with liver metastases), AST (aspartate aminotransferase)/ALT (alanine aminotransferase) less than or equal to 3X the ULN for the local reference lab (less than or equal to 5X the ULN for patients with liver metastases)