The investigators could hypothesize that age-related changes in body composition parameters play a role in the variable tolerance to chemotherapy in the elderly.

However none of the studies relating body composition and chemotoxicity included elderly as a specific subpopulation. Furthermore in the majority of studies, body composition analyses are based on the estimation of muscle mass by CT scanner (axial L3 section). This method is to date not validated in the elderly cancer patients. Nevertheless some studies used Dual Energy X-ray Absorptiometry (DEXA), which is considered the gold standard in the assessment of body composition in older adults.

The investigators main hypothesis is that the appendicular muscle mass (I.e. muscle mass of the 4 limbs) operationalized as an index by dividing the muscle mass by squared height following Baumgartners' approach (Baumgartner, 1998) measured by DEXA (total of muscle mass of 4 limbs / height ²) represents a predictive factor of chemotoxicity in the elderly.

The finding that body composition is associated with poor tolerance of chemotherapy could lead to consider these parameters in the treatment decision of the elderly cancer patients and improve the current decision-making algorithms when treating older adults.

Inclusion Criteria:

• Breast, prostate, bladder, colo-rectal, ovarian cancers, and lymphoma
• Metastatic or locally advanced neoplasm
• Initiation of first line chemotherapy
• Performance status World Health Organization (WHO) 0-3
• Capacity to give a written informed consent
• Life expectancy > 3 mouths

Exclusion Criteria:

• Concomitant targeted therapy
• Concomitant targeted radiotherapy
• Height > 196 cm, weight > 136 kg (DEXA not feasible)
• Hemopathy excluding lymphoma
• Cognitive impairment compromising the well proceeding and security of the study
• Cognitive impairment compromising the obtaining of a written informed consent

Elderly cancer patients treated with chemotherapy