Breast cancer is a type of cancer that originates in the breast tissue. Changes in breast shape, fluid coming from the nipple, a newly inverted nipple, or a red or scaly patch of skin are signs of breast cancer. Risk factors associated with this type of cancer include obesity, a lack of physical activity, alcoholism, hormone replacement therapy during menopause and a family history of breast cancer. It usually develops in cells from the lining of milk ducts and the lobules, which supply milk to these ducts. A biopsy of the concerning tissue makes diagnosis possible for breast cancer. After diagnosis, treatment planning should be utilized for determining the suitable treatment options according to the personalized needs of the patients. Tamoxifen and raloxifene are the two medications that can be used to prevent breast cancer in people who are at a high risk of developing it. Another preventive measure is surgical removal of both breasts in patients with a high risk. This book includes some of the vital pieces of work being conducted across the world, on various topics related to breast cancer. The extensive content of this book provides the readers with a thorough understanding of the therapy techniques and treatment planning for this disease.