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Seeing double can be a good thing Many human breast cancers harbor activating mutations inPIK3CA , the gene coding for the catalytic subunit of phosphoinositide 3-kinase (PI3K). Clinical trials are underway to evaluate the efficacy of PI3K inhibitors in cancer patients. Vasanet al. found unexpectedly that a subset of breast cancers harbor not one—but two—PIK3CA mutations, and the mutations occur on the same allele (see the Perspective by Toker). In model systems, the double mutations hyperactivate PI3K signaling and enhance tumor growth. Preliminary analysis of clinical trial data suggests that breast cancers with double mutations are more responsive to PI3K inhibitors than those with a single mutation.PIK3CA mutational status could help identify the breast cancer patients most likely to benefit from these drugs.Science , this issue p.714 ; see also p.685

Double PIK3CA mutations in cis increase oncogenicity and sensitivity to PI3Kα inhibitors