The US researchers say that early screening would be most effective among three ethnic groups:Afro-Americans, whites, and Asians.
Among the major ethnic groups in the USA, only Latinos should wait until 50 years to be screened, researchers from the University of California, Irvine, USA, said.
Researchers found that screening would be most effective if it began at the age of 42 for people of African origin, at 44 among people of European origin, and at 46 among Asians.
Age at start of screening, based on ethic origin:|
African: 42 years
European: 44 years
Asian: 46 years
Latino: 50 years
Researcher Dr Charles Theuer said: "The recommendations of screening at age 50 may be effective for the population as a whole.
"But our study shows large variations in the way cancer develops among ethnic groups, suggesting that we need to change the timing and techniques of screening and tailor them to each group."
His fellow-research Hoda Anton-Culver warned that, even if the policy were adopted, it should not be regarded as fixed forever.
He said: "Lower rates among Asians and Latinos should not indicate that those groups do not need screening. These rates may be due to higher immigrant populations, whose cancer rates may change as they adopt more Western diets and lifestyles."
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