ERBB2 and neoplasm: We previously described such assays for the quantification of HER1 and HER2 in tumour cryosections.23,24 As the use of these TR-FRET assays is limited by the need of fresh or freshly frozen tumour tissues, we now developed new TR-FRET assays to quantify HER1, HER2 and HER3 in FFPE tumour samples.