7. Abnormal aspartate aminotransferase (AST; SGOT), alanine aminotransferase (ALT; SGPT), or alkaline phosphatase levels (> 3 times the upper level of normal) or an abnormal total bilirubin level (> 1.5 times the upper level of normal) or creatinine clearance < 50 ml/min (calculated using the Cockcroft-Gault formula);