Epidemiology is a vital module of public health practice. The discipline aims to afford the basis to prevent disease and to endorse the health of populations through the study of the occurrence and distribution of health-related states or events, with the study of determinants persuading such states. 

Epidemiology, outlet of medical science that studies the distribution of disease in human populations and the factors determining that distribution, mainly by the use of statistics.

The epidemiology of cancer is the study of the aspects affecting cancer, as a way to infer probable trends and causes. The study of cancer epidemiology customs epidemiological methods to find the source of cancer and to recognize and develop improved treatments. 

Epidemiologists will frequently specialize in the source of diseases and the different factors that contribute to population health problems. Meanwhile, biostatisticians characteristically specialize in the effects of health issues, for example, the implications of genetics, the environment or biological factors.