Can Colon Cancer With Metasis On Liver Be Cured With Treatment?

Hi sir, My sister is diagnosed with colon cancer with metasis on liver. presently It is treated with chemo (avastin -6 dose & Oxilin - 5 dosage completed). I also have test / scan reports and can be send to you. She is very bold and health condition is fine. She also look very fresh one or two days of each chemo. My question is ; Is it curable once treated. Is these medicines are proper. Is there any additional treatment and precautions we may take?