CF: Let cervical cancer of the uterus that is caused by a viral infection. This is the most common cancer among women in these countries, whereas in developed countries, it is disappearing because of good hygiene and health systems able to diagnose it early..

CF: It varies across the globe. In Latin America, is the cancer of the cervix in women and lung cancer than men (as in Europe). Then the stomach cancer (decreasing in Europe thanks to refrigerators).

In India among men is cancer of the mouth is the most common because they are accustomed to chewing tobacco. Mongolia is the cancer of the liver due to hepatitis B. With good behavior and good environmental conditions could prevent between 40 and 50% of cancers.

However, it is very difficult to get an overall assessment, both the variety of cancers is high and complex phenomenon. The day we know everything about cancer, it will mean a thorough knowledge of biology as a whole, since the biology of cancer is related to all aspects of living matter.

In Switzerland and other rich countries, increase the number of cancers due to aging of the population. In the third world, cases are increasing because these countries are both affected by all forms of cancer linked to poverty and increasingly by those who match the behavior in rich countries.