the most current and accurate information about treatment is from the NCCN guidelines
(for physicians) and watch the videos here

Read the up-to-date patient information sheets here.

More specific topics are noted below
 
 Lumpectomy and radiation for invasive
 Lumpectomy and radiation for DCIS
 Partial breast irradiation (e.g. Mammosite)
 Accelerated (short course) breast radiation
 All other radiation topics
 All other treatment topics