Evaluation of the Role of Connected Scales in the Therapeutic Care of Hematology Patients

This study tests whether using a smart connected scale (a scale that sends data to a care team remotely) can help monitor weight changes and improve care for patients with aggressive non-Hodgkin lymphoma or multiple myeloma who are receiving chemotherapy. Weight changes can be an early warning sign of complications, and smart monitoring may allow faster intervention. **You may be eligible if...** - You are 18 or older with aggressive non-Hodgkin lymphoma or multiple myeloma - You are starting or have recently started (within 2 cycles) systemic chemotherapy, or are preparing for a stem cell transplant - You can be contacted by phone and can return home after initial hospitalization - You read and understand French **You may NOT be eligible if...** - Your expected survival is less than 3 months - You have moderate-to-severe cognitive impairment - You have a pacemaker - You are in another interventional clinical trial - You are pregnant - You are under legal protection Talk to your doctor to see if this trial is right for you.