- Adequate hepatic and renal function as defined by serum bilirubin ≤ 25 µmol/L; alkaline phosphatase, alanine transaminase (ALT) and aspartate transaminase (AST) ≤ 2.5 times the upper limit of normal if no demonstrable liver metastasis or ≤ 5 times the upper limit of normal in the presence of liver metastasis; serum creatinine ≤ 120 µmol/L.