Cholangiocarcinoma may recur after surgery. Cancer is cancer because of its malignant biological characteristics of easy recurrence, metastasis, infiltration, growth and invasion of other organs. Cholangiocarcinoma is the more aggressive of malignant tumors, i.e. more malignant. After receiving surgery to remove the primary cancerous lesion, this condition is impossible to remove the potential cancer cells scattered around, the tiny cancer cells invisible to the naked eye, by surgery. There is also a clinical term specifically called subclinical lesions, which requires the use of radiotherapy after surgery for further treatment to prevent the rapid recurrence of tumor lesions in the short term, but in any case, it is difficult to prevent the cancer from completely not recurring after surgery.