In general, Wilms' tumor is curable. If the tumor is only in the kidney, it can be removed along with the whole kidney. This procedure is called a nephrectomy. During the operation, the surgeon checks if the other kidney has a tumor. If there are tumors in both kidneys, a piece of the tumor will be removed. After the surgery, the child is given some chemotherapy drugs like Dactinomycin. This drug is also known by its trade name Cosmegen.