The process of metastasis formation is hugely complex, as described in the introductory chapter of this book, and this complexity has led us to compile two volumes of methods, from a vastly divergent background that attempts to encompass the whole spectrum of cancer biology. This first volume, Metastasis Research Protocols: Analysis of Cells and Tissues, concentrates on analysis and mapping of molecules produced by cells and tissues and analysis of the molecular biology underlying their expression, whereas the second volume, Metastasis Research Protocols: Cell Behavior In Vitro and In Vivo,focuses sharply on the determination of cell behavior in vitro and in vivo. We have deliberately included chapters describing well-established and familiar te- niques (for example, SDS-PAGE and Western blotting [Chapter 11], and immunocytochemistry [Chapter 2]) in addition to the newer and more speci- ized approaches and specific examples of their application, because—although the methodology is readily available in the published literature and established in many laboratories—we wished these volumes to “stand alone” and to make accessible here the standard techniques that underpin much metastasis research for both the newcomer to the field and the seasoned researcher. Undoubtedly, owing to the complexity of the metastatic cascade and the wealth of research techniques involved in scientific approaches to its unraveling, and despite our best efforts to make these volumes as comprehensive as seems feasible, this is a tall order, and there will inevitably be omissions. For these we apologize.