Cancer Information Service: John and Mary Pappajohn Clinical Cancer Center: Holden Comprehensive Cancer Center: University of Iowa Health Care

Risk Factors and Their Importance
Causes of Human Cancer

Tobacco/smoking	30%
Diet/obesity	30%
Sedentary lifestyle	5%
Occupational exposures	5%
Family history of cancer	5%
Viruses	5%
Perinatal factors/growth	5%
Reproductive factors	3%
Alcohol	3%
Socioeconomic status	3%
Environmental pollution	2%
Ionizing/ultraviolet radiation	2%
Prescription drugs/medical procedures	1%
Salt/other food additives/contaminants	1%
Source: Colditz GA, DeJong HW, Hunter DJ, Trichopoulos D, Willett WC. Causes of Human Cancer. Rapid Science Publishers, 1996.

Last modification date: Wed Feb 21 16:50:11 2007
URL: http://www.uihealthcare.com /depts/cancercenter/patients/riskfactors.html