Figure 2.

Heat maps show the rank rank hypergeometric overlap (RRHO): the red color along the diagonal axis shows a higher similarity between two gene expression profiles. The bottom left represents the similarity between the upregulated genes, while right upside represents the similarity between downregulated genes between two gene expression profiles. In (i), heat maps between squamous cell carcinoma and neuroendocrine lung carcinoma show more similarity as compared to the other two comparisons, i.e., (ii) between squamous cell carcinoma and renal cell carcinoma and (iii) between renal cell carcinoma and neuroendocrine lung carcinoma.