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Two years later, after she learned she had breast cancer, she took a more complete genetic test from a different lab. This time it was positive.

A study released earlier this month suggested that this experience could be widespread. Nearly 90 percent of the 100,000 participants, who carried a BRCA mutation, would have been missed by 23andMe’s test, geneticists found. The finding has ignited a debate about the risk and value of online health tests.

23andMe’s testing formula for this risk is built around just three genetic variants, most prevalent among Ashkenazi Jews. The new study demonstrated that most people carry other mutations of the gene, something many doctors have long suspected.

…continue reading ‘Don’t Count on 23andMe to Detect Most Breast Cancer Risks, Study Warns’

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New York Times

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