This is a wide-ranging book devoted to preinvasive lesions of the human body. Written with the aim of serving experts to not only diagnose but also understand the etiopathogenesis of precursor lesions, the book also endeavors to identify its molecular and genetic techniques. Chapters in this book consist of a significant quantity of novel information with an efficient categorization of intraepithelial lesions of the cervix and the vulva. This book has been modernized according to the most recent technological developments and can be described as a brief, educational and practical text at all levels, discussing the important role of the molecular analysis of intraepithelial lesions.