Figure 6From: Tumour necrosis factor-alpha expression in tumour islets confers a survival advantage in non-small cell lung cancer Mast cell immunohistochemical double-staining tryptase (brown) and TNFα (red) demonstrating the presence of TNFα in tryptase + mast cells. Arrowhead = double-stain cell. Black arrow = single-stain red cell. Grey arrow = single-stain brown cell.Back to article page