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A wide variety of tumours show PIK3CA mutations leading to increased phosphatidylinositol-3 kinase (PI3K) activity. We have determined the frequency of PIK3CA mutations in exons 9 and 20 that has previously been reported as mutational hotspot regions in distinct tumour models. One hundred and fifty gastrointestinal carcinomas (47 gastric and 103 colorectal) that were characterised for MSI status (76...
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