Preoperative CRT With Capecitabine ± Temozolomide in Patients With LARC

"For each cohort of MGMT hypermethylated versus MGMT unmethylated, patients will be randomised (ratio 1:1 for each arm) into preoperative CRT with capecitabine or preoperative CRT with temozolomide plus capecitabine arms.~Chemotherapy during preoperative chemoradiotherapy:~Capecitabine and temozolomide will be administered during radiotherapy with drug holidays (weekend break).~dosage: Capecitabine 825 mg/m2 twice daily, Temozolomide 75 mg/m2/day"