期刊
MELANOMA RESEARCH
卷 16, 期 2, 页码 197-200出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/01.cmr.0000200488.77970.e3
关键词
Akt; cutaneous melanoma; NRAS; PIK3CA; BRAF
Recent studies have shown that the PIK3CA gene, which encodes the p110 alpha catalytic subunit of phosphatidylinositol 3-kinases, is mutated in human cancers. To determine whether PIK3CA is altered in cutaneous melanoma, we screened a series of 101 melanoma metastases. We identified PIK3CA missense mutations in three metastases (3%). Interestingly, these mutations were observed only in tumours that were negative for NRAS mutations. Using immunohistochemistry, we also analysed our metastases for the expression of phosphorylated Akt. These analyses revealed a moderate to strong phosphorylated Akt expression in 78% (21 of 27) of metastases with NRAS mutations and in 73% (54 of 74) of metastases without NRAS mutations. Interestingly, the three metastases with mutations in PIK3CA all exhibited a strong expression of phosphorylated Akt. Taken together, our results show that PIK3CA is mutated in a minority of melanomas and suggest that mutations in this gene may represent an alternative mechanism of Akt activation in cutaneous melanoma.
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