CD63 and anaplastic astrocytoma: Similar results were found when examining the correlation between overall survival and tumor cell staining intensity (diffuse astrocytoma: p = 0.25; anaplastic astrocytoma: p = 0.24; glioblastoma: p = 0.88), CD63+ tumor blood vessel score (diffuse astrocytoma: p = 0.93; anaplastic astrocytoma: p = 0.74; glioblastoma: p = 0.27), as well as tumor blood vessel staining intensity (diffuse astrocytoma: p = 0.96; anaplastic astrocytoma: p = 0.74; glioblastoma: p = 0.73).