Abstract
This edition of Annals of Oncology contains two related articles on cancer prevalence [1, 2]. The first describes the EUROPREVAL Project, its methods and some broad findings, while the second gives details of cancer prevalence estimates based on data from several European Cancer Registries. EUROPREVAL is a natural extension of another exercise in quantitative gigantism, the EUROCARE-2 study [3], and takes advantage of data obtained from the quality assurance programmes put in place, in this instance by 38 cancer registries in 17 countries.