Participants will be selected at the first oncological visit at the Outpatient Clinics or the Department of Medical Oncology of the IRCCS Policlinico San Matteo of Pavia. The doctor, evaluated the inclusion and exclusion criteria, will propose patient to participate in the study and, after obtaining informed consent, will proceed with enrollment. On the first day of chemotherapy, participants will undergo an oncological and nutritional examination, with collection of anthropometric data, assessment of body composition, assessment of quality of life through special validated questionnaires, blood sampling for blood chemistry tests and urine collection. Participants in the treated group will receive a supply of the FSMP to take home. At check-up visits, the participant's nutritional status and any adverse events will be assessed, other than adherence to treatment by delivery of empty product boxes and chemotherapy compliance. Blood chemistry tests will be repeated at 6 weeks after the first chemotherapy cycle and 3 weeks after the last chemotherapy cycle (follow-up period).
