PGR and neoplasm: pERK1/2 was significantly associated with smaller size (p = 0.001), lower grade (p < 0.001), ER/PR+ve tumours (p < 0.001), molecular subtype (p < 0.001), lower necrosis (p = 0.003), weak Klintrup-Makinen (KM) grade (p = 0.004) and lower b-lymphocyte levels (p = 0.020).