Figure 1From: Chromogenic in situ hybridisation for the assessment of HER2 status in breast cancer: an international validation ring studyStudy design. Each of the 5 centres forward 5 blinded, unstained slides from each sample to the next centre for chromogenic in situ hybridisation (CISH) analysis (thick arrows). Results from each centre are reported back to centre A every 2 months (thin arrows).Back to article page