After one chemotherapy session after surgery for 73-year-old colon adenocarcinoma, try not to give up chemotherapy as long as your body tolerates it, only by completing all chemotherapy can you effectively prevent recurrence and metastasis. Chemotherapy is the main treatment for tumor, and effective chemotherapy can prevent tumor recurrence and metastasis. Therefore, if a 73-year-old man suffers from colon adenocarcinoma, he should try to complete all chemotherapy cycles after surgery as long as his body can tolerate it. If the body can not tolerate the chemotherapy, consult the relevant doctors whether radiation therapy, targeted therapy or oral chemotherapy drugs can be used for treatment. Post-operative colon cancer patients should pay attention to choose light, easy-to-digest and nutritious food, such as fish, eggs, milk, soy products, etc. Food should be diversified, with meat and vegetables, and nutrition should be balanced. The specific treatment plan needs to be determined by the doctor after evaluation.