Historical Aspects of Xeroderma Pigmentosum and Nucleotide Excision Repair -- Clinical Features of Xeroderma Pigmentosum -- Xeroderma Pigmentosum and Skin Cancer -- XPA Gene, Its Product and Biological Roles -- XPB and XPD between Transcription and DNA Repair -- XPC: Its Product and Biological Roles -- The XPE Gene of Xeroderma Pigmentosum, Its Product and Biological Roles -- XPF/ERCC4 and ERCC1: Their Products and Biological Roles -- XPG: Its Products and Biological Roles -- Xeroderma Pigmentosum Variant, XP-V: Its Product and Biological Roles -- Other Proteins Interacting with XP Proteins -- The Nucleotide Excision Repair of DNA in Human Cells and Its Association with Xeroderma Pigmentosum -- Roles of Oxidative Stress in Xeroderma Pigmentosum -- Xeroderma Pigmentosum: Its Overlap with Trichothiodystrophy, Cockayne Syndrome and Other Progeroid Syndromes -- Population Distribution of Xeroderma Pigmentosum -- Progress and Prospects of Xeroderma Pigmentosum Therapy -- Animal Models of Xeroderma Pigmentosum.