Abstract: In comparison with primary tumors, where the organ by itself is the starting point of the malignant degeneration, metastases inherit a different emergence. The molecular causes leading to secondary liver malignancies are unknown so far. The aim of the present invention is therefore to make available an easy and efficient method for identifying therapeutical targets in secondary tumors, the use of novel therapeutical targets identified by the method for screening and determining beneficial means and/or drugs, and means and drugs for identifying, labeling and treating secondary metastases in the liver made up of or derived from tumor cells of the colon. In principle, expression of transcription factors is studied in the primary tumor, the secondary tumor and in the healthy organ, wherein the secondary tumor is formed, according to the invention, in particular of transcription factors being enriched in the healthy tissue of the organ, wherein the secondary tumor is formed, e.g.