The first step is to forget the cancer part of the equation initially. Treat what you see using all of the tools of Chinese Medicine and nothing more. With breast cancer there is often LV Qi Stagnation and/or Dampness, but there are other underlying patterns. Start with the basics and don't treat "cancer", treat the "person". This is true for nearly every condition and will rarely lead you astray whereas chasing after symptoms or secondary effects of underlying imbalances will almost never get you where you need to be.
That said there are some points that we add specifically for breast cancer in addition to whatever you would use to remedy the persons underlying pattern. And these points are the same whether we are using acupuncture, tuina, or as Dave mentions above Tong Ren which is an energy healing system we use that I've written about to you specifically previously (click the Tong Ren menu button at the top bar for more information).
If you click on the "breast cancer" link that was automatically created below your post you will find articles, techniques, etc. that relate to treatment (still under production). Within that page you will also see the tong ren therapy protocol for breast cancer (or you can click that title) which has the points we very often use.