Impaired Geriatric 8 Score is Associated with Worse Survival after Radiotherapy in Older Patients with Cancer

J. G. Middelburg^*, R. A. Middelburg, the LPRO (Dutch National Organization for Radiotherapy in the Elderly), M. van Zwienen, M. E. Mast, A. Bhawanie, J. J. Jobsen, T. Rozema, H. Maas, E. D. Geijsen, A. H. van der Leest, D. H.J.G. van den Bongard, J. van Loon, T. Budiharto, M. J. Aarts, C. H.J. Terhaard, H. Struikmans