I H Kunkler1, J M Dixon2, M Maclennan3, N S Russell4. 1. Cancer Research UK Edinburgh Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, United Kingdom. Electronic address: i.kunkler@ed.ac.uk. 2. Breast Surgery Department, Western General Hospital, Edinburgh, United Kingdom. 3. Edinburgh Cancer Centre, Western General Hospital, Edinburgh, United Kingdom. 4. The Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands.