Protein-energy malnutrition (PEM) is a frequent condition in patients suffering from cancer, especially the elderly. According to some studies, this malnutrition has important consequences in this population, by increasing the risk of treatment toxicities, premature interruption of chemotherapy, mortality and risks of complications. Identifying cases of malnutrition is an objective pursued by the National Nutrition and Health Programme and an important task of the "Unités de Coordination en Oncogériatrie".

The main goal of this study is to assess the loss of weight over the 6 month-period preceding the cancer treatment, regardless of kind (chemotherapy, targeted therapy, hormone therapy, immunotherapy, radiation therapy, surgery, comfort care), in the elderly suffering from cancer.

Inclusion Criteria:

• Over 70 years of age
• Suffering from cancer
• Waiting for a treatment decision (whatever it is)
• Hospitalized in a hospital or come to consult in a hospital during the period of inclusion (2 periods of 6 weeks for two consecutive years)
• Affiliated to a social security system

Exclusion Criteria:

• Patient unable to receive information regarding the study and/or provide its non objection regarding the use of its data
• Patient under tutorship or curatorship, deprived of freedom or placed under judicial protection

Elderly people, who are more than 70 years old, suffering from cancer, waiting for a treatment decision and taken care of in a hospital