MOST is a longitudinal study whose aim is to test the hypothesis that frailty markers are better at detecting vulnerable patients and that they are a better "Adverse Events" predictive tool than the CGA (Comprehensive Geriatric Assessment) in older cancer patients referred for chemotherapy. The second hypothesis is that a brief screening tool based on a combination of some frailty markers and some used in the CGA would help the oncologist detect patients requiring a more complete geriatric assessment