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Receiver-operating characteristic analysis shows a higher area under the curve for ratio of the pixel density value of annexin A7 in primary GC. At a cut-off level of > 0.505, the pixel density value of annexin A7 exhibited 76.7% sensitivity and 88.3% specificity for detecting lymphatic metastasis of primary GC tissues. Area under the ROC curve: 0.882, 95% CI: 0.796-0.967, P < 0.001.
