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. 2009 Jan 6;100(2):298–304. doi: 10.1038/sj.bjc.6604861

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Copyright © 2009 Cancer Research UK

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Serum EGF and TGF-α level at baseline and disease progression in patients with tumour EGFR expression and low initial ligand levels. ^aStaining intensity/percentage of positive cells. Dotted lines in the figures represent cutoff values of each ligand (EGF 667 pg ml⁻¹ and TGF-α 14 pg ml⁻¹). Abbreviations: EGFR, epidermal growth factor receptor; EGF, epidermal growth factor; TGF, transforming growth factor.