Understand prognostic indicators that guide adjuvant treatment of colon cancer (Stage 2 disease MMR/MSI +ve)

A 56 year-old Caucasian woman presents with iron deficiency anemia. A colonoscopy performed reveals an ulcerative lesion in the ascending colon. Biopsy is consistent with adenocarcinoma. A CT Chest/Abdomen/Pelvis shows the colonic lesion without any evidence of distant metastasis. She undergoes a right hemicolectomy which reveals a T3 lesion with 0/17 lymph nodes involved. Testing for mismatch repair proteins shows absence of MLH1/PMS2 protein.

What do you recommend?