This book covers important biological, immunological, and molecular information essential for understanding the rationale and results of experiments and clinical observations on cell-cell and cell substrate adhesion; hydrolytic activities, cell motility; immunological and other host elements of the host-tumor ecosystem (at different sites of the metastic process); genetic and epigenetic elements of the acquisition and the expression of invasive phenotypes. 38 tables and 60 computer-drawn figures provide comprehensive overviews, and a methodological chapter emphasizing the differences and similarities between assays and their relevance for natural situations has also been included. Clinical and experimental cancer researchers, as well as as post-graduate students interested in cancer research, will find this book to be an indispensable reference resource.