Evaluation of the Humoral and Tumoral Molecular Alteration Profile of Brain Metastases

The purpose of the study is to determine in brain metastases and according to feasibility in liquid biopsies: * Molecular alterations including in particular mutations, amplifications, Copy number gene variants and fusion transcripts identified by high-throughput sequencing; * The rate of variation either in gain or in loss of expression of the different messenger Ribonucleic Acids by analysis of the transcriptome; * Epigenetic alterations by methylation of deoxyribonucleic acid clusters by methylome chips.