The curtain of depression is rising on the cancer drama. Although many scientific and emotional events will surely recur before the green curtain of hope will totally replace that purple curtain of sorrow and despair, progress is being made. One of the attitudes that is changing and adding to that change is evidence that cancer is not an "inevitable" disease. As has been the case with other "malignant" diseases like tuberculosis and rheumatic fever, mechanisms can and will be identified, removed, or frustrated before the end result, an incurable malignancy, has developed.
A method of tracking down these inciting or promoting agents is epidemiological study. The text presents mortality statistics of specific cancers. These mortality statistics are studied from many vantage points. The evaluation of cancer mortality in relationship to age, sex, color, marital status, geographical area, urbanization, social and economic status, and origin of birth are all looked at