“Cancer is a class of diseases characterized by uncontrolled cell growth. There are over 100 different types of cancer, and each is classified based on the type of cell initially affected” (What is cancer? What causes cancer?,1). Most cancers damage the body when cells begin to divide and form clumps of tissue called tumors. However, leukemia affects cells in the bloodstream. While some tumors can grow to affect different systems of the body, some are not dangerous and are called benign tumors. There are many types of cancer, some more dangerous than others. Those among the most frequently diagnosed include breast cancer, ovarian cancer, kidney cancer, colon and rectal cancer, and lung cancer. Breast cancer is characterized by a malignant or cancerous tumor that develops in the cells of the breast. In most cases of breast cancer, the cancer begins in the cells of the milk-producing ducts. If these cancerous cells make their way to other, uninfected breast tissue, they can reach the lymph nodes under the arms. Once inside the lymph nodes, the cancer manages to spread to other parts of the body. Breast cancer stages are determined by how far the cancer cells have spread beyond the original tumor. Many women diagnosed with breast cancer report that the first sign is a mass of tissue felt on the breast. Even so, most women brush off these lumps and don't get tested on time. Other symptoms of this type of cancer include swelling of all or part of the breast, skin irritation, breast pain, or a lump in the armpit area. It's possible, however, that some of these symptoms could signal something less serious like a cyst. “About 1 in 8 women in the United States (just under 12%) will develop invasive breast cancer over the course of their cou...... half of article ......mptoms/understand_bc/statisticsNo Author. (2013). Statistics. Retrieved February 4, 2014, from http://www.ovariancancer.org/about-ovarian-cancer/statistics/No Author. (2013). Lung cancer. Retrieved February 4, 2014, from http://www.cancer.org/cancer/lungcancer-non-smallcell/detailedguide/non-small-cell-lung-cancer-key-statistics No author. (2013). What is kidney cancer? Retrieved February 4, 2014, from http://www.cancer.org/cancer/kidneycancer/detailedguide/kidney-cancer-adult-what-is-kidney-cancer No author. (2013). What is colorectal cancer? Retrieved February 4, 2014, from http://www.cancer.org/cancer/colonandrectumcancer/detailedguide/colorectal-cancer-what-is-colorectal-cancer No author. (2013). Types of treatment. Retrieved February 4, 2014, from http://www.cancer.org/treatment/treatmentsandsideeffects/treatmenttypes/treatment-types-landing”