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Specific mutations in the BRCA1 gene are well known to increase a woman’s risk of breast and ovarian cancer. However, there are thousands more BRCA1 gene mutations whose effects on cancer risk are unknown. In a sweeping new study, researchers deliberately created every possible mutation in the BRCA1 gene and studied its effects in breast cancer cells. This allowed the researchers to classify the mutations as either harmful or benign. With this data publicly available, healthcare professionals can use it to better interpret genetic testing results and advise patients of their cancer risk. Read more in a story from STAT News.