POU2F2 and neoplasm: OCT2 was expressed in a much smaller proportion of tumours (5; 14%), all of which were either positive for SSX2-4 and SAGE1 or negative for both markers (Figure 3B); there was a negative trend between OCT2 and SSX2-4 expression, although this did not achieve formal statistical significance (p = 0.08, Fisher's exact test).