EGFR and lung cancer: Our previous results have shown that, the dynamic metabolic parameter Ki has better differential diagnostic efficacy in the differential diagnosis of lung cancer, N-staging and prediction of EGFR status (Ki cut-off values, respectively: 0.0250 ml/g/min, 0.0220 ml/g/min, and 0.0350 ml/g/min), in particular, it improves specificity (7, 8).