Comparison of human cerebellar tumors with the developing murine cerebellum indicated that WNT, SHH, and group 3 tumors consisted of subgroup-specific undifferentiated and differentiated neuronal-like malignant populations, whereas group 4 tumors were exclusively comprised of differentiated neuronal-like neoplastic cells [21, 57]. This evidence concerns the gene SHH and cerebellar neoplasm.