Abstract
With the aid of IGF2 and VEGF in situ hybridization; tyrosine hydroxylase, chromogranin A, and Ki67 immunohistochemistry; and TUNEL staining applied to a large series of clinical neuroblastomas and to an animal model, we show here that stroma-poor neuroblastomas show evidence of chromaffin differentiation similar to that of type 1 small intensely fluorescent (SIF) cells and that this occurs in a vascular-dependent fashion, indicating a role for local tumor hypoxia in the differentiation process.
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