Effect of Sarcopenia on the Occurrence of Toxicity Related to Anti-cancer Treatments

Inclusion Criteria: * Patients over 18 years old * Patient with a diagnosis of a histologically proven solid malignant tumor with an indication for systemic treatment during initial treatment. * CT/PET performed within 45 days before initiation of systemic treatment. * Patient able to sign informed consent for participation in the study * Patient affiliated to a social security system Exclusion Criteria: * History of cancer in the five years preceding inclusion other than localized skin or cervical cancers. * Patient with cancer not requiring systemic treatment. * Pregnant women. * Patient with a pace maker or defibrillator * Patient deprived of liberty or benefiting from a legal protection measure