organized by the Unité de recherches biomathématiques et biostatistiques, under the auspices of the Institut national de la santé et de la recherche médicale, the Association pour la recherche sur le cancer, and the European Society of Pathology, Villejuif (France), October 14-17, 1985 ; edited by J.Y. Mary and J.P. Rigaut
edited by Robert H. Riddell ; sponsored by the Crohn's & Colitis Foundation of America, Inc., the National Institutes of Health, the Rebecca Meyerhoff Philanthropic Fund