Lung tumor histology.

<p>(A) H&E staining of a lung tumor. (B) Darkfield microscopy of a different section of the same tumor. (C) The overlay of darkfield and fluorescence images with the nanoparticles from the darkfield image in orange, the CD31 stain in green and DAPI in blue. The yellow arrow denotes a cell (most likely a macrophage) with cytoplasm filled with nanoparticles. The scale bar represents 50 µm in all panels.