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Anne-Laure Couderc,1,2 Celia Boisseranc,3 Dominique Rey,1 Emilie Nouguerede,1 Laurent Greillier,4,5 Fabrice Barlesi,4,5 Florence Duffaud,4,6 Jean-Laurent Deville,6 Stéphane Honoré,3,4 Patrick Villani,1,2 Florian Correard3,4 1Internal Medicine, Geriatry and Therapeutic Unit, AP-HM, Marseille, France;Coordination Unit for Geriatric Oncology (UCOG), PACA West, Marseille, France; 2Aix-Marseille Université, CNRS, EFS, ADES, Marseille, France; 3Pharmacology Department, AP-HM, Marseille, France; 4Aix-Marseille University, Marseille, France; 5Multidisciplinary Oncology and Therapeutic Innovations Unit, AP-HM, Marseille, France; 6Oncology Unit, AP-HM, Marseille, FranceCorrespondence: Anne-Laure CoudercCoordination Unit for Geriatric Oncology (UCOG), PACA West, University Hospital of Marseille (AP-HM), 270 Boulevard De Sainte Marguerite, Marseille 13009, FranceTel +33 491744530Fax +33 491744833Email anne-laure.couderc@ap-hm.frBackground: Polymorbidity induces polypharmacy in older patients may lead to potential drug–drug interactions (DDI) which can modify the tolerance and safety of oncological treatments and alter the intended therapeutic effect. The objective of our study was to describe the decision-making process for oncological treatment and related outcomes, in a population of older adults undergoing a comprehensive geriatric assessment (CGA) associated to a comprehensive medication reconciliation (CMR) prior to initiating oncological treatment.Methods: ChimioAge is a prospective observational study conducted between 01/2017 and 07/2018 at Marseille University Hospital and approved by the French National Ethics Committee. It comprised all consecutive patients aged 70 years and over who were referred for a CGA as part of CMR, before initiating systemic treatment.Results: One hundred and seventy-one cancer patients were included. Mean age was 79.2 years, over half had metastatic cancers, 75% had an ECOG performance status zero o