Study of Circulating Tumoral DNA in Metastatic Choroidal Melanoma

Circulating tumor DNA detection and quantification in patients with metastatic choroidal melanoma.

Technique development: In first step, the different available techniques will be evaluated for specificity and sensibility using serial dilutions of cell lines with or without GNAQ mutation. Validation: The tumor DNA detection rate will be estimated from metastatic uveal patient's blood. The investigators will study 40 patients to obtain at least 15 patients bearing a GNAQ mutation in the primitive tumor or in metastasis. With those 15 patients, the investigators will determinate the most sensitive technique and the best cost/efficiency ratio.