Figure 2.

Classification of lung cancer by means of hierarchical clustering (adapted from [12]). The columns correspond to individual tumor specimens, the rows to individual genes, which are grouped according to their similarity by means of cluster analysis. The analysis identified the four main types of lung cancer and the three subtypes of adenocarcinoma. Characteristic genes that are responsible for the grouping of the tumor types are listed to the right. In case of green coloring the respective genes of the tumor specimens were subject to reduced expression at the mRNA level, red signifies overexpression.