ERBB2 and neoplasm: A majority of the remaining eight proteins were associated with molecular subtypes characterised by oestrogen-receptor (ER) positive tumours, such as AOC2, which was associated with a higher risk of ER-positive [OR: 2.02, 95% CI: 1.48 to 2.75; PP4: 0.73], luminal A [OR: 2.07, 95% CI: 1.51 to 2.83; PP4: 0.99], and luminal B-HER2 negative tumours [OR: 2.54, 95% CI: 1.43 to 4.51; PP4: 0.99].