Reproductive System The reproductive system is a group of organs that work together to create new life. The majority of the organs of the reproductive system are the external genitalia and internal organs, including the gonads that produce gametes. The external genitalia are located in the pelvis and vulva, while the gonads are the testes and ovaries. The female reproductive organs are located inside the pelvis, while most male reproductive organs are located outside the body. The largest part of the male reproductive system is the penis, while the female reproductive system is the vagina. The breast is one of the many parts of the reproductive system. The breast is an organ that contains mammary glands, milk ducts and adipose tissue. In the center of each breast is a nipple that releases milk as it begins producing new life. The areola is a thick piece of skin that surrounds the nipple and protects the tissues underneath during breastfeeding. There are many types of problems that have to do with the breast, such as breast cancer. Breast cancer is a malignant tumor that begins in the cells of the breast, usually starting within the milk ducts or lobules. A malignant tumor is a cancer cell that can develop in tissues or spread to different parts of the body. Doctors say one in eight women will be diagnosed with breast cancer in their lifetime. Breast cancer is the most diagnosed cancer in women and is the second leading cause of death for them. Although breast cancer is mostly found in women, men can also get breast cancer, but it is very rare. Doctors are not sure what the exact cause of breast cancer is. Doctors say that some of the causes may be, the older you get, the more the chances increase, the start of the menstrual cycle before the age of twelve or the transition to menopause before the age of fifty-five. Risk of b...... means of cells...... of paper, or by placing radioactive material inside one's body; Side effects may include fatigue, sun-induced skin rashes, or tissue swelling. There are different types of breast cancer stages. Staging indicates how far the cancer has spread within the body, staging is determined after breast cancer is diagnosed and stages range from 0 to 4 depending on how far it has spread. Stage 0 cancer cells are found in only one location, stage I cancer cells have left the milk ducts but have not reached the lymph nodes, stage II cancer increases in size and has reached the lymph nodes in the armpit, cancer stage III has spread to the cervical lymph nodes or tissue around the breast, stage IV cancer has spread to other organs. The treatments are Herceptin which causes cell death, Kadcyla, a drug that kills cells, introduced into tumor cells, Tykerb and Perjeta. All of these treatments have side effects.