The cause of the cancer cannot determined very easily.it varies from different conditions.The causative factors of cancer can include environmental changes and the replication of human DNA.Mutations causes a cancer then we can find whether it is environmental mutagens or arise as spontaneous errors during the replication of DNA.when people migrates to other countries.The environment also plays a mutual part in cancer.
Japan has the less type of cancers like Large Intestine,Breast and prostrate.But cancer of stomach is very less than United States.When They Migrates to United States.it should be much lesser than previous years.The Japaneses are only tend to marry within their group.its because of the environmental changes more than some genetic factors.it should be normal or less by one or two generations.The main cause for this are diet that should be the part of our cultural heritage rather than our pollution like environmental changes.The main cause of cancer in generations are due to the replication of DNA.its according to the Genes and some Hormone factors.Cancer also cause due to some Genetic problems in Humans
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