The Pros and Cons of Cancer Registration E. Grundmann It may seem strange for somebody to hold a symposium on cancer regis- tration and then submit a paper under the heading "The Pros and Cons of Cancer Registration." Indeed, this may be quite amazing to those of my colleagues who have been endeavoring for years or decades to provide a world-wide system of cancer registration. To be quite frank, this is exactly what I intended. Generally speaking, as scientists we are convinced that the work we do is worth while. We are in fact supported in this attitude by pub- lic opinion, if one bears in...