Approximately 20 percent to 25 percent of patients with hereditary breast cancers and up to 10 percent of patients with any type of breast cancer have a BRCA mutation, which disproportionately affects Askenazi Jewish women.
Critics say the sensational study by an Israel-born geneticist omitted factors that refute its findings, including the similarity between European and Middle Eastern Jews.
A push to keep French Jews from fleeing anti-Semitic violence is exposing tensions between integration-minded progressives and a more insular Sephardic majority.