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A) Distribution of circulating tumor cell (CTC) counts in 7.5 mL of peripheral blood sampled from primary lung cancer patients with and without distant metastasis (metastatic lung cancer and nonmetastatic lung cancer, respectively). B) Receiver operating characteristic (ROC) curves for CTC counts and serum Carcinoembryonic Antigen (CEA) levels for discriminating metastatic lung cancer patients from nonmetastatic lung cancer. Figures taken from Tanaka et al.25
