Analysis of the correlation between polySia-NCAM expression and tumor differentiation (INPC) revealed that polySia-NCAM and NCAM were expressed more frequently in undifferentiated and in poorly differentiating than in differentiated neuroblastomas, but the P-value did not reach significance (P = 0.623 for polySia-NCAM, and P = 0.165 for NCAM) (Table 2). The gene discussed is NCAM1; the disease is neuroblastoma.