Re:A gene, not THE gene (Score 1)

The article does nothing of the sort. The kid will be born without the MUTANT ALLELE for BRCA1 that causes predisposition to breast cancer. If s/he were born without the BRCA1 gene locus, s/he would almost definitely develop cancer (all sorts of them), since BRCA1 is a tumor suppressor. If you knock out a tumor suppressor, you get tumors (hence the name). The oncogenic allele is a loss-of-function for the normal gene.