The purpose of this study is to evaluate the efficacy of dendritic and cytokine-induced killer cells (DC-CIK) for colorectal cancer (CRC).

60 patients with stage Ⅲ CRC, who had received neoadjuvant and (or) adjuvant chemotherapy or (and) radiotherapy according to NCCN guidelines, and got complete response (CR), will be randomly divided into group A (receive DC-CIK treatment) or group B (just regularly follow up), and the randomize ratio will be 1:1. Patients in group A will receive 2-3 cycles of DC-CIK cells treatment (every 4 weeks). Patients in group B will have no anti-tumor therapy.

Inclusion Criteria:

1. Male or female patients ≥ 18 years of age;
2. CRC with histological diagnose, and had received neoadjuvant and (or) adjuvant chemotherapy or (and) radiotherapy and got complete response (CR) with imaging;
3. Patients who have a life expectancy of at least 3 months;
4. Eastern Cooperative Oncology Group (ECOG) performance status was 0 - 1;
5. The bone marrow functioned normally (WBC > 4.0×109/L, Hb > 120 g/L, PLT > 100×109/L);
6. The ECG results were normal, and the liver and kidney were functional.

Exclusion Criteria:

1. Patients who had distant metastases;
2. Patients with uncontrolled infection; underlying disease that was severe or life-threatening;
3. Patients who were pregnant or lactating;
4. ECOG perform status ≥ 2;
5. Patients who are suffering from auto immune diseases or patients who need to accept glucocorticoid treatment.