6. The subject has adequate hepatic function as defined by a total bilirubin level </= 1.5 * the upper limit of normal (ULN) (bilirubin >/= 1.5 * ULN with known Gilbert's disease is allowed), and alkaline phosphatase, aspartate aminotransferase/alanine aminotransferase (AST/ALT) </= 2.5 * the upper limit of normal or </= 5.0 * ULN if liver metastases are present.