I am sorry to hear about your sister-in-law. My husband was diagnosed Jan. 2004. He falls into the "older" group. We have a 19 year old daughter. I avoid statistics and negativity. Each person is an individual and no one can predict outcomes. I have read volumes and have taken to focusing on what we can do rather what we can't. We even had to tell my husband's personal physician to talk to the oncologist.
Your sister-in-law is young and attitude and spirituality all play important roles. No symptoms is a good thing not bad. My husband goes for acupuncture once a week and has done so far over a year. The chinese doctor he sees for this works with traditional medicine. He also has an immune booster which was researched at a cancer center in Tampa. He also takes supplements and avoids all sugar. This from a man who loved desserts particularly ice cream. I dont think traditional alone works but you have to let all doctors know what you intend to take. His all concur and have no objections. There have been a few things they told him to avoid because it could interfere with the chemo. Good luck!!