"It is the first 'thou shalt not' gene marker in colon cancer, " says Memorial- Sloan-Kettering colon cancer specialist Leonard Saltz, a pioneer in testing Erbitux.

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But here we have a variant of a normal gene which seems to be a marker for survival.

WSJ: A Gene Gives a Hint Of How Long a Person Might Hope to Live

Chalfie's 1994 paper on the gene popularized it as a genetic marker.

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