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