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1From the Division of Head and Neck Cancer Research, Department of Otolaryngology-Head and Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland; 3The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland; the 4Laboratory of Molecular Pathology, "Casa Sollievo della Sofferenza," San Giovanni Rotondo, Italy; and the 5Department of Ophthalmology, Hadassah University Hospital and the Hebrew University Hadassah School of Medicine, Jerusalem, Israel.
PURPOSE. BRAF T1796A activating mutations have been found in a high proportion of cutaneous melanomas, cutaneous nevi, and papillary thyroid carcinoma and in a small fraction of other cancers. This study was designed to investigate the incidence of BRAF T1796A mutation in uveal melanoma.
METHODS. Twenty-nine formalin-fixed, paraffin-embedded posterior uveal melanomas were included in the study. DNA was extracted from the paraffin sections followed by PCR amplification of exon 15 and detection of the common BRAF missense mutation (T
A transversion at nucleotide 1796) using restriction enzyme analysis.
RESULTS. Although positive cutaneous melanoma control cell lines harbored the T1796A BRAF mutation, none of the 29 uveal melanomas harbored the mutation.
CONCLUSIONS. These data suggest that BRAF T1796A activating mutation is not common in primary uveal melanoma. These findings are in accord with known differences in tumorigenesis between uveal and cutaneous melanomas.
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