Study Evaluating Two Treatment Strategies for Rectal Cancer in Patients ≥75 Years Old

"6 cycles of FOLFOX4s intravenously: Oxaliplatin 85mg/m² over 2h, folinic acid 400mg/m2 (or L-folinic acid 200 mg/m2) over 2h, Fluorouracil bolus 400mg/m², Fluorouracil: 2400mg/m² over 46h, every 14 days for 12 weeks (max: 6 cycles). FOLFOX4 regimen will be started 2-4 weeks after completion of radiotherapy"

25Gy in 5 fractions of 5Gy delivered in one week (short-course radiotherapy)