David Paul von Hansemann: Contributions to Oncology: Context, Comments and ... - Leon P. Bignold, Brian L. D. Coghlan, Hubertus P.A. Jersmann - Google Books

https://books.google.de/books?id=i2fEpOXxgvkC

In 1890, just a few years after the discovery of the chromosomes, David Paul Hansemann, a pathologist-in-training with the famous Rudolph Virchow in Berlin, produced a theory of the pathogenesis of cancer involving the key current concept: that the first…