Cancer is a term for abnormal, uncontrolled cell growth that results in failure. Uncontrolled cell growth can lead to the development of tumors that are either begin or malignant. Metastasis, or the production of secondary malignant tumors, can develop in distant tissues if the primary tumor goes undetected and untreated. Statistical information details cancer as a health issue prevalent in all societies. Males have a higher incidence of and mortality from cancer compared to females. The most common male cancer is lung cancer, and the most common female cancer is breast cancer. The good news, however, is that the mortality rate for most cancer types is declining.