Your AST and ALT
are not that much elevated to be worried.Breast cancer
can spread to the liver
.But,it is better for you to go for an ultrasound
abdomen and rule out spread to liver.
Or else go for a PET scan and search for secondaries in various parts of the body.
So,elevated enzymes can be due to drugs or breast cancer spread to liver or any obstruction in the common bile duct.
If you come back with ultrasound report,i will clarify further