But that isn't really causing an evolution because the viability of the person isn't really impacted... the cancer-proof person is still going to have 1.6 kids at age 30 like the cancer-prone person, or like the person who needs to wear glasses... as compared to the 'natural' model where the longer-lived individual would reproduce more times than the shorter-lived and consequently encourage a shift in the genetic pool...
Plus que vous en pensez... genetiquement, tous les etres humains sont descendus d'un indivudu male et une individuelle femme...
http://en.wikipedia.org/wiki/Mitochondrial_Eve
http://en.wikipedia.org/wiki/Y-chromosomal_Adam




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