<qa>  What is the maximum limit of a serum aspartate aminotransferase?7. Patients must have a serum aspartate aminotransferase AST and alanine aminotransferase ALT within 5 times the upper limit of normal and a total serum bilirubin of less than 3 times the upper limit of normal, both of which define the upper limit of grade 2 treatment related toxicities.. 