to detect particular pathology both direct and indirect bilirubin to be measured separately. then obstructive or hepatocellular jaundice can be ruled out. Breast cancer
has a chance to spread to liver causing early changes like increase in bilirubin and SGPT. so you should monitor them closely. You may consult a gastroenterologist
but your oncologist
can guide you better. reason of colonoscopy
is not clear to me, because you have not mentioned related history. anyway follow your doctors' advise.