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• W2078763518 abstract "The molecular basis of endometrial cancer (EC), a common gynecologic malignancy, often includes mutational activation of the PIK3CA and KRAS genes. We aimed to determine the distribution of mutations in the two genes depending on patient clinocopathological characteristics. We sequenced exon 1 of the KRAS gene and exons 9 and 20 of the PIK3CA gene in 108 consecutive EC tumor samples. PIK3CA mutations were present in 24 of the 108 (22.2%) cases and KRAS mutations in 18 of the 108 (16.7%) cases. PIK3CA mutations occurred more frequently in KRAS-mutated samples (7/18, 38.9%; p = 0.06) than in KRAS wild type (17/90, 18.9%) and showed a very high frequency in metastatic tumors (4/9, 44.4%; p = 0.1) and in samples displaying serous differentiation—serous and mixed endometrioid/serous tumors (6/12, 50.0%; p = 0.021)—where KRAS mutations were rare (11.1% and 16.7%, respectively) and did not exist independently of a PIK3CA mutation. Non-hotspot (i.e., non-E542K, -E545K, and -H1047R) mutations in the PIK3CA gene showed higher frequency in metastatic cases (3/9, 33.3%; p = 0.05). Tumors displaying serous differentiation showed a particular pattern—they harbored exclusively mutations in PIK3CA exon 20 (5/12, 41.7%; p = 0.005) and most of these were non-hotspot (4/12, 33.3%; p = 0.02). In all other comparisons exons 9 and 20 mutation distribution did not differ. These results suggest the need for further exploration of the significance of PIK3CA mutations in respect to aggressive EC." @default.
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• W2078763518 date "2010-02-01" @default.
• W2078763518 modified "2023-10-14" @default.
• W2078763518 title "Rare Mutations in the <i>PIK3CA</i> Gene Contribute to Aggressive Endometrial Cancer" @default.
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• W2078763518 doi "https://doi.org/10.1089/dna.2009.0939" @default.
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