Interestingly, whereas most of the tumours analysed displayed a very low percentage of S100B + cells (43 tumours had < 1% of S100B + cells and 19 tumours < 0.1% S100B + cells), a small fraction of them had a higher percentage of S100B + cells reaching a maximum of 9.55% (Fig. 2B). This evidence concerns the gene S100B and neoplasm.