CD34 and astrocytoma (excluding glioblastoma): While the immunohistochemical labeling of some glioblastomas for CD34 is recognized [19, 25], this phenomenon is generally foreign to infiltrating astrocytomas of lower grade and to neoplasms of the oligodendroglioma group [2, 5, 6, 10, 13–15, 28, 29, 32, 36, 43, 45–47].