Figure 1From: Validation of a blood protein signature for non-small cell lung cancerProbability Density Function plots of HSP90 and MMP7 distributions for each training site control group. (a) HSP90 is an example of a protein affected by preanalytic variability and the plot demonstrates the bias between control groups. (b) MMP7, selected from the high quality training samples, is consistent between sites.Back to article page