Down's gene boost fights cancers

"The life expectancy of people with Down's has risen sharply, and now averages 60 years."
This sentence has some problems. Because the relation between life expectancy and cancer seem to be ignore, because person who has long lived than the other might has higher risk to get cancers than the other one.
"People with this genetic disorder have higher risk of leukemia, but seem to have lower risk of some other cancers"
It means the method is not good enough, so this news is meaningless for me.
"The study suggests that a gene which offers protection against the development of certain tumors may increase the risk of cancer spread.
I think it might be good news for modern technology. For my department, although we are discovering new therapies rather than prophylaxis, I think prophylaxis is more important than cure. Cancers are new disease for we modern human beings. I think this disease is produced by modern technology. Because the chemistry product and nuclear technique, the environment is filled with many dangerous molecules.

Friday, 4 January 2008 from BBC today