The book has three main results parts. Chapter 3 illustrates the first independent validation study of a 70-gene signature developed from gene expression profiling for use in breast cancer prognosis and demonstration of its ability to add independent prognostic information to the clinical prognostic factors currently used. The successful validation of this study preceded the design and implementation of a world-wide randomized clinical trial evaluating the gene signatures clinical utility. This trial has commenced and is currently recruiting in Europe. Chapter 4 describes the...