regarding different histologic types chemotherapy produced response rates of 56 % in pnets ( primitive neuroectodermale tumors ) , 49 % in medulloblastomas , 32 % in ependymomas , 31 % in brain stem gliomas , and 30 % in astrocytomas/glioblastomas .
C0004114
astrocytomas
C0017636
glioblastomas