Role Of Various Factors In The Development Of Cancers

Most cancer types vary in incidence and mortality among different populations in different parts of the world. When populations move from one country to another, the rates for many cancers tend toward that of the local population rather than that of their country of origin. A classic example is the incidence rates among Japanese individuals living in Osaka, Japan, in contrast to those who have moved to Hawaii (Fig. 3-9).49 Within a generation, the incidence for prostate, colon, and breast cancer begin to approach those of the United States population, whereas the incidence of stomach cancer, more prevalent in Japan, decreases. Another interesting point from the data in Figure 3-9 is that from 1970-71 to 1988-92, some of the ''more Western cancers'' became more prevalent in Japan, presumably because of a more Westernized diet and lifestyle.

Some specific causes of cancer are known, the most prominent of which is cigarette smoking (Table 3-5). However, the causes for the large

Table 3-4. Summary of Epidemiological Data on Intracranial Tumors


(WHO Grade)

Typical Location

Age at Clinical Manifestation (% of Cases)

0-20 years 20-45 years >45 years


Survival Rate (% of Patients)

Genetic Alterations

Pilocytic astrocytoma


10 Ways To Fight Off Cancer

10 Ways To Fight Off Cancer

Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.

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