Along with documenting treatment breakthroughs, breast cancer research can offer insight into the safety and success of reconstruction procedures. A few key studies on breast implants can be found here:
Cancer Research UK
Independent Review Group on Silicone Breast Implants
Institute of Medicine Report on the Safety of Silicone Implants
National Cancer Institute Breast Implant Study
Clinical Data on Mentor MemoryGel® Breast Implants

There are also many resources for conducting your own research into specific breast cancer topics, including:
American Cancer Society
National Cancer Institute Homepage
National Cancer Institute Silicone Breast Implant Study
State Laws on Insurance Coverage for Breast Reconstruction
Evaluating Health Information on the Internet