Multiple myeloma is caused by the activation of cancer genes by chromosomal rearrangement. We have been developing a Web site which we call the Myeloma Gene Index that would catalog all genes expressed in myeloma cells. We hope to use this information to develop a myeloma microarray (where all genes in myeloma cells are spotted on glass microscope slide), a high throughput tool that would help us understand the differences among patients, thereby helping us in the future to tailor patient specific therapeutic strategies.