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

"On the day of excision of the cerebral metastasis, additional biological samples (blood test and lumbar puncture) will be taken in the operating room.~A biological sample of the tumor tissue (brain metastases of a solid cancer with contrast uptake of at least 1 cm accessible to surgical excision) will also be taken and preserved by freezing, in accordance with current practice and after obtaining their written agreement. .~Biological samples (liquid biopsies and tumour) from patients who have explicitly expressed their consent will be kept after the end of the research as part of a biobank in order to be able to carry out any additional analyses."