The Metastasis Group of the European Organization for Research on Treatment of Cancer (EORTC) held an International Meeting at the Royal Institution in London on April 2lst-23rd, 1980. The subject was "Clinical and Experimental Aspects of Metastasis" and these Proceedings are the record of that Meeting. Almost all of those who presented a paper or a poster have written up their contributions as chapters of the Proceedings and we have made no distinction here between posters and oral communications. The Organizers and Editors owe a considerable debt of gratitude to all the contributors who...