Relationship between viability and receptor expression level in glioma cell lines. Viability is determined 3 days after infection with adenovirus (HAd) or SFV and is given as percentage of control (100%; average ± S.E.M., n = 3 parallel wells/group) at the same time point. Cells were derived from glioblastoma (003-GB, 027-GB, and 038-GB), oligodendroglioma (004-OD and 020-OD), and oligoastrocytoma (015-OA, 025-OA, and 026-OA) patients. MOI was 10 for adenoviruses (HAd5, HAd3, and HAd11p) and 1 for SFV.