Validation of the FIRST simplified frailty scale using the ECOG performance status instead of patient-reported activities

Affiliations

• ¹ Department of Hematology, Cancer Center Amsterdam, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
• ² Department of Hematology, HOVON Data Center, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.
• ³ Department of Research and Development, Netherlands Comprehensive Cancer Organisation (IKNL), Utrecht, The Netherlands.
• ⁴ Department of Public Health, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands.
• ⁵ Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.
• ⁶ Department of Internal Medicin, Albert Schweitzer Hospital, Dordrecht, The Netherlands.
• ⁷ Department of Hematology, South Elvsborg Hospital, Borås, Sweden.
• ⁸ Department of Hematology, St Olavs Hospital/Norwegian University of Science and Technology, Trondheim, Norway.
• ⁹ Department of Hematology, Cancer Center Amsterdam, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands. [email protected].