Dear editor,Radiotherapy is a cornerstone in the management of anal or rectal cancer.Because elderly patients are often excluded from clinical trials,little is known about radiotherapy’s therapeutic index(e cacy/toxicity ratio)in the geriatric population[1].Still,the ageing of population imposes the challenge to treat older cancer patients Dear editor, Radiotherapy is a cornerstone in the management of anal or rectal cancer. Patients often elderly patients are often excluded from clinical trials, little is known about radiotherapy’s therapeutic index (e cacy / toxicity ratio) in the geriatric population. [1]. Still, the ageing of population imposes the challenge to treat older cancer patients