Given the large variety of rare cancers,they take up a significant part of our daily practice. Therefore, we owe it to our patients with rare tumours that we use the knowledge gained in the treatment of the more common cancers to provide them with a better future. This knowledge comes from recent developments in molecular diagnostics, systemic treatments with new drugs and targeted therapies together with advanced technologies in the areas of radiology and radiation therapy. Our authors have analysed the literature and recommend treatments for rare cancers based on results from past studies. We hope that this book will be an aid to those treating rare cancer cases about which, up to now, little has been published, and will reassure our patients that they have not been forgotten.