ERBB2 and neoplasm: In the tumor tissue, comparable amounts of αPD-1 were detectable after injection of both vectors, ranging from 1.9 ± 0.11 ng αPD-1/mg protein (n = 3, mean ± SD) for Her2-AAVαPD−1 and 3.28 ± 1.22 ng αPD-1/mg protein (n = 3, mean ± SD) for AAV2αPD−1.