The aim of Dr Petermann's project is to treat human cell lines with BPDE and use molecular biology methods, such as microscopy, to characterise the new homologous recombination pathway in detail. This will reveal new insights into the effects of benzopyrene exposure in the cells, which is important for understanding environmental causes of cancer and cancer development in general. Such insights can improve political decisions around environmental and occupational safety regulations, and help to develop new approaches for the assessment of individual risk, as well as early detection, diagnosis and treatment of cancer.