The book presents key topics at the forefront in breast development and cancer research in chapters authored by leading scientists in the field. The chapters provide a basis for understanding major concepts, model systems, cells of origin and heterogeneity in human breast development and cancer. The book builds on this understanding to guide readers through the cellular and molecular basis of breast cancer and the most important signaling pathways. Finally, the book describes mechanisms of metastasis and cancer immunity, and treatment options and resistance to therapy. It is targeted at young scientists and early career researchers and provides an overview of current topics in breast cancer research. Each chapter includes key learning points, boxes and conclusions to highlight the most important information. This book will interest anyone who wants to learn about the main areas of breast cancer research and the most important recent advances.