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Other factors in the environment are exposures to viruses. The hepatitis  virus may cause cancer of the liver in Africans exposed both to this virus and to another toxin. The Epstein-Barr virus may cause a cancer of the lymphoid tissue in Africans and cancer of the nose and throat in Chinese.

There are some cancers which may be due only to environmental factors. In this second group are tumors of the stomach and large bowel, the prostate, ovary, breast, womb and cervix and some tumors of the kidney and bladder.

This group forms about 40 per cent of male cancers and 60 to 70 per cent of female cancers. Some believe most of these cancers are due to exposure to industrial chemicals, others think they are mainly due to lifestyle.

Perhaps only about 6 per cent of cancers can be shown definitely to be due to work exposure.

The third group is mainly cancers of children and no association can be found with external factors, not that they may not exist.

*240/71/1*

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