The influence of radiographic phenotype and smoking status on peripheral blood biomarker patterns in chronic obstructive pulmonary disease.

PLoS One · 2009 · PMC2730536 · PMID 19718453

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showed a trendno p-value reported

This is in contrast to serum EGFR concentrations, which were directly associated with FEV1 ( Table 5 ) and showed a trend toward decreasing with increasing GOLD classification in former, but not current, smokers ( Fig. 4 ).

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