Hello, my brother has colon cancer, had surgery in January 2018. After that he underwent chemotherapy 8 times. During the 7th chemo, my brother complained of back pain with the same symptoms before the operation, and after a scan the doctor said the cancer had returned and the gland had hit the liver. The doctor in charge said my brother would be chemo with a dose of twice as much medicine.
From the information you have conveyed, a history of surgery with colon cancer, and a test result that shows the spread of cancer to the liver, shows that cancer cells have spread to other organs or the liver and lymph nodes.
In certain conditions, advanced cancer is treated with chemotherapy or radio therapy or maybe a combination of both. This is done because the cancer cannot be operated on because of certain medical conditions. Therefore, you should advise your sister to continue with the plans of the doctor who treats your sister. Thus, it is hoped that the spread and growth of cancer cells can be prevented. It is hoped that your brother's condition will improve later.
However, you can discuss all of this directly with the doctor who treats your brother, because the doctor who treats your sister better understands your sister's current clinical condition.
That's the info we can convey, also read about intestinal-cancer.