Breast cancer is a type of cancer that starts from the breast cells. Some of its common symptoms are formation of lump in the breast, dimpling of breast skin, and changes in the size and appearance of the breast. There are many different types of breast cancer such as ductal carcinoma in situ, invasive lobular carcinoma, angiosarcoma, Paget's disease of the breast and inflammatory breast cancer. Factors such as obesity, lack of physical exercise, alcoholism, hormone replacement therapy during menopause, and ionizing radiation may result in the development of breast cancer. It can be diagnosed with the help of biopsy. The treatment of breast cancer involves performing surgery, prescribing medications, and therapies such as chemotherapy or radiation therapy. A number of latest researches have been included in this book to keep the readers updated with the latest concepts related to the biological and clinical progress in breast cancer. It is an excellent resource guide for oncologists as well as students.