Molecular Characterization of Perivascular Epithelioid Cell Tumors

Inclusion criteria: * Major patient (≥18 years) * Minor patient (1 to 17 years old) * PEComas diagnosed in France between 01/01/1990 and 15/09/2019 and reviewed by a sarcoma referral pathologist Exclusion criteria : * Opposition of the patient (or the holders of parental authority) to participate in the study * Biological tissue from a patient who does not meet all the inclusion criteria * Classic triphasic angiomyolipoma or lymphangioleiomyomatosis * Inability to provide informed information to the subject * Patient under court protection * Patient under guardianship or curatorship