MSLN and neoplasm: The mean percentage positivity for biomarkers in tumour vs. normal tissue was as follows: for KOC 74% vs. 0.4%; for S100P 75% vs. 0.3%; for mesothelin 75% vs. 4%; and for MUC1 75% vs. 18% (Table 2, p < 0.0001 for all tumour vs. normal comparisons).