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Receiver–operating characteristic (ROC) curve of the association between epidermal growth factor receptor (EGFR) mutation and cumulative smoking dose. The optimal cut‐off for the test is the point closest to the upper‐left corner of the graph, which corresponds to a mutation in EGFR. AUC, area under the ROC curve (a) ROC for total 1001 cases. (b) ROC for 779 adenocarcinoma cases.
