I don't think anybody in this thread moved to talking about tumor sequencing.
I'm just responding to:
"""Genetic tests for cancer are a different kind of genetic test. They test the tumor itself for mutations that are present only in the tumor, not in the rest of the body."""
Strictly speaking, BRCA is a genetic test for cancer (even if it's only a "risk factor"), and it's done on the regular genome, not on the cancer.
I'm just responding to:
"""Genetic tests for cancer are a different kind of genetic test. They test the tumor itself for mutations that are present only in the tumor, not in the rest of the body."""
Strictly speaking, BRCA is a genetic test for cancer (even if it's only a "risk factor"), and it's done on the regular genome, not on the cancer.
(None of this is important or really relevant)