In 2012, an estimated 1,638,910 people in the United States will be diagnosed with cancer, and 577,190 will die of cancer1. In the United States, cancer accounts for nearly 1 out of every 4 deaths. Cancer is the second most common cause of death in the United States, exceeded only by heart disease2. Worldwide, cancer is a leading cause of death, accounting for 7.6 million deaths (around 13% of all deaths) in 20083. Deaths from cancer worldwide are projected to continue to rise to over 13.1 million in 20304. Screening may reduce cancer morbidity and mortality since many cancers have a high chance of cure if detected early and treated adequately.