Subject and method: 36 rectal cancer patients at stage II-III underwent preoperative chemoradiationof 50.4Gy/28fx concurrent with Capecitabine 825mg / m2, twice a day × 5 days / week followed by 12 - 16 weeks consolidation chemotherapy of FOLFOX or CAPEOX from April 2022 to April 2023 at Nghe An Oncology Hospital.