TP53 and neoplasm: In addition, p53 levels measured by immunohistochemistry and given as a p53 score of 0–3, were higher in tumour samples (80% = score of 3, 20% = score of 2) and adenoma samples (50% = score of 3, 30% score of 2, 20% score of 1) than normal tissue (100% = score of 0).