RT Journal Article SR Electronic T1 HER2 testing in the UK: further update to recommendations JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 818 OP 824 DO 10.1136/jcp.2007.054866 VO 61 IS 7 A1 R A Walker A1 J M S Bartlett A1 M Dowsett A1 I O Ellis A1 A M Hanby A1 B Jasani A1 K Miller A1 S E Pinder YR 2008 UL http://jcp.bmj.com/content/61/7/818.abstract AB These guidelines update the previous UK HER2 testing guidelines and have been formulated to give advice on methodology, interpretation and quality assurance to ensure that HER2 testing results are accurate, reliable and timely with the expansion of testing to all patients with breast cancer at the time of primary diagnosis. The recommendations for testing are the use of immunohistochemistry but with analysis of equivocal cases by in situ hybridisation to clarify their HER2 status or the use of frontline fluorescence in situ hybridisation (FISH) testing for those laboratories wishing to do so; the inclusion of a chromosome 17 probe is strongly recommended. Laboratories using chromogenic or silver in situ hybridisation should perform an initial validation against FISH. For immunohistochemistry and in situ hybridisation there must be participation in the appropriate National External Quality Assurance scheme.