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The research team first studied patients who are at a high risk of developing breast or ovarian cancers because they inherit a faulty copy of the cancer gene -- BRCA2 -- from their parents.

According to her statement, in February 2023, Munn took a genetic test that checked for cancer genes — including BRCA, the most well-known breast cancer gene — and tested negative across the board, only to find out two months later that she had breast cancer.

She said she tested negative for all of them, including BRCA, the most well-known breast cancer gene.

Some viruses used to deliver genes to treat other conditions have been linked occasionally to cancer because they may activate a cancer gene or give the engineered cells a growth advantage.

Some gene-delivering viruses have been implicated in rare cases of cancer for other forms of gene therapy, as their insertion of DNA into the cell’s chromosomes may unintentionally activate a cancer gene or give the engineered cells a growth advantage.