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NEW YORK (GenomeWeb) — Mayo Clinic researchers have demonstrated in a new study that measuring CYP2D6 status from breast tumor tissue can be inaccurate due to loss of heterozygosity in the CYP2D6 gene region. The authors argue that this may be the reason why some large studies have failed to show a connection between CYP2D6 genotype and response to tamoxifen.

The group published the study online this month in the Journal of the National Cancer Institute.

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