which genes causes breast cancer?
Even a cursory google should lead you to e.g. BRCA, however if you think there is only 1 gene that can cause cancer, I suggest you start with some more fundamental reading.
This seems to be part of a series of one-sentence cancer-related questions today.
Take a look at the genes mentioned in the abstract of this paper: https://www.nejm.org/doi/full/10.1056/nejmoa1913948 .
Also, please don't re-post a question that's been deleted (with the reason for the deletion having been communicated to you). It does not help you in the long run.
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