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(a) Receiver operating characteristic (ROC) analysis for tumour size on histopathology, CT lung window scan, CT mediastinal window scan and modified tumour shadow disappearance rate (mTDR) for differentiating between limited (nodes, metastasis (NM)-negative) and advanced disease (NM-positive) patients. The best cut-off was seen at mTDR = 0.13. (b) ROC analysis for mTDR for tumour sizes ≤3 cm and for all sizes.
