PGR and breast cancer: Dawson et al (2010) recently published an evaluation of the role of oestrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor receptor-2 (HER2) and B-cell lymphoma 2 (BCL2) expressions in the prognosis of breast cancer using data generated from TMAs with tumours from more than 11 000 breast cancer cases from five studies.