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Kaplan–Meier curves of overall survival (OS) according to whether or not surgery at the primary lesion has been done. a patients with bone metastases only: surgery = 10 patients, no surgery = 11 patients; b patients with liver metastases only: surgery = 290 patients, no surgery = 498 patients; c patients with lung metastases only: surgery = 13 patients, no surgery = 32 patients; d patients with DL metastases only: surgery = 26 patients, no surgery = 54 patients
