Pattern of antigen expression by tumor cells from different diagnostic categories of pediatric solid tumors.

−: negative; +lo :low expression levels/cells; +: positive; +hi: strong expression levels/cells.Both CD7 and CD8 were systematically negative in all tumors analyzed.*The only ganglioneuroblastoma tumor analyzed showed a similar profile but it contained two distinct populations which differed on CD56, CD9 and CD81 expression, in the absence of CD117. CD271 was only partially present in one neuroblastoma tumor.§% of positive cells only among positive case.