Combining category, tumour differentiation degree and the Oct4+ cell percentage, we found that high Oct4+ cell percentages were more likely to be found in uNB with a low number of Oct4− cells [12 of 68 cases (17.6%)] rather than in more differentiated tumours or cases with high number of Oct4− cells (Fig. 1). Here, POU5F1 is linked to neoplasm.