Book excerpt: The culture of cancer cells is routinely practiced in many academic research centers, biotechnology companies, and hospital laboratories. Cancer Cell Culture: Methods and Protocols describes easy-to-follow methods to guide both novice and more experienced researchers seeking to use new techniques in their laboratories. Our present understanding of the cell and molecular biology of cancer has been derived mainly from the use of cultured cancer cells and we cover a number of the most widely used assays to study function in current use. Part I introduces the basic concept of cancer cell culture and this is followed by a description of the general techniques used in many cell culture facilities. The importance of cell line characterization is now widely recognized and methods to characterize and authenticate cell lines are described in Part II. Part III covers the isolation and development of specific cancer cell types and provides valuable tips for those wishing to derive new cell line models. A wide range of procedures encompassing many of the key functional features of cancer cells are described in Part IV including assays to evaluate clonogenicity, cell proliferation, apoptosis, adhesion, migration, invasion, senescence, angiogenesis, and cell cycle parameters. Methods to modify cancer cells are described in Part V, including protocols for transfection, development of drug-resistance, immortalization, and transfer in vivo. In Part VI methods of coculture of different cell types and contamination of cell lines are covered.