- Serum bilirubin ≤upper normal limit (UNL); ALT, AST ≤ UNL but ≤ 2.5 x UNL in case of liver metastases; alkaline phosphatase (liver isoenzyme fraction) ≤ UNL or ≤1.5 x UNL of in case liver metastases; albumin within normal limits.