The same analysis was performed in order to determine (1) the amount apoptotic cells (positivity to Tunel reaction), (2) proliferation rate (Ki67 staining) and (3) malignant potential (positivity to Anti-GD2 antibody), in order to correlate the expression level of MCM2 and CA9 not only to the growth of the tumor but also to its expected dangerousness. Here, CA9 is linked to neoplasm.