The Cancer Prevention Study (frequently abbreviated CPS) is the name of a series of cohort studies conducted in the United States by the American Cancer Society.
The first Cancer Prevention Study, known as CPS-I, recruited subjects between October 1959 and February 1960.
[2] It has been described as "a key guide to national policy and changing public attitudes" with regard to the link between cigarette smoking and lung cancer.
[5] Subjects examined in this study include putative cancer risk factors such as obesity and diet.
[3] The third Cancer Prevention Study, known as CPS-3, began enrollment in 2006[2] and completed recruitment in December 2013.