Figure 4.

Kaplan–Meier curve of overall survival (a–c) and cancer-specific survival (d–f) according to the performance of local treatment to the primary tumor. (a and d) Few exceptional cases of patients with liver metastases benefited from local treatment of the primary tumor. (b and e) No significant differences were found in the prognosis between patients with single lung metastasis regardless of the reception of local treatment. (c and f) Patients with isolated regional lymph node metastases benefited from local treatment of the primary tumor.