Abstract
The recessively inherited nucleotide excision repair (NER) defect syndrome xeroderma pigmentosum (XP) serves as a model disease for UV-induced skin cancer. XP is characterized by sun-sensitivity, freckling, and poikilodermic skin changes in sun-exposed areas, and a more than 1000-fold increased risk of skin cancer including melanoma as well as basal and squamous cell carcinomas. Seven XP complementation groups (XP-A to XP-G) are known to date representing the defective genes in XP patients. An additional "variant" form (XPV) which is clinically indistinguishable from the complementation groups exhibits defective translesional synthesis. An enhanced understanding of skin cancer development in general can help to identify individuals at an increased risk who should take special precautions, for example to avoid occupational exposures. The position of skin cancer induced by UV-light as an occupational disease in the ordinance on industrial diseases (BKV) is currently a topic of research and discussion in Germany.
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