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Context: In advanced cancer, although performance status (PS), systemic inflammatory response and nutritional status are known to have prognostic value, geographical variations and sociodemographic indexes may also impact survival., Objectives: This study compares validated prognostic factors in two international cohorts and establishes a prognostic framework for treatment., Methods: Two international biobanks of patients (n=1.518) with advanced cancer were analyzed. Prognostic factors (Eastern Cooperative Oncology Group Performance Status [ECOG-PS], body mass index [BMI] and modified Glasgow Prognostic Score [mGPS]) were assessed. The relationship between these and survival was examined using Kaplan-Meier and Cox regression methods., Results: According to multivariate analysis, in the European cohort the most highly predictive factors were BMI <20 kg/m 2 (hazard ratio [HR] 1.644), BMI 20-21.9 kg/m 2 (HR 1.347), ECOG-PS (HR 1.597-11.992) and mGPS (HR 1.843-2.365). In the Brazilian cohort, the most highly predictive factors were ECOG-PS (HR 1.678-8.938) and mGPS (HR 2.103-2.837). Considering gastrointestinal cancers in particular (n=551), the survival rate at 3 months in both cohorts together ranged from 93% (mGPS 0, PS 0-1) to 0% (mGPS 2, PS 4), and from 81% (mGPS 0, BMI >28 kg/m 2 ) to 44% (mGPS 2, BMI <20 kg/m 2 )., Conclusion: The established prognostic factors that were compared had similar prognostic capacity in both cohorts. A high ECOG-PS and a high mGPS as outlined in the ECOG-PS/mGPS framework were consistently associated with poorer survival of patients with advanced cancer in the prospective European and Brazilian cohorts., (Copyright © 2022 American Academy of Hospice and Palliative Medicine. Published by Elsevier Inc. All rights reserved.)