A comprehensive collection of classic and innovative methodologies used in many laboratories for the investigation of multiple myeloma. These readily reproducible techniques range from the standard Plasma Cell Labeling Index methodology to a final chapter on making sense of microarrays, and include the full spectrum of cytogenetic and molecular diagnostic methods. The protocols follow the successful Methods in Molecular Medicine™ series format, each offering step-by-step laboratory instructions, an introduction outlining the principle behind the technique, lists of the necessary equipment and reagents, and tips on troubleshooting and avoiding known pitfalls. These proven techniques are ideal for studying the pathogenesis of multiple myeloma and identifying new therapeutic targets.