Research Article

Inadvertent Transfer of Murine VL30 Retrotransposons to CAR-T Cells

Table 6

Genome copy number (GCN) and vector copy number (VCN) of VL30 and -RVV (respectively), in DNA samples extracted from primary human T-cells as determined by qPCR analysis. DNA samples 1, 2, 5, 6, 7, 11, 12, and 13 were extracted from human T-cells treated with the -RVV SFG.iC9.GD2.CAR.IL15. DNA of samples 3, 4, 8, 9, and 10 extracted from naïve primary human T-cells and served as biological negative controls. DNA extracted from naïve 293T cells served as technical negative control (−cont). ND indicates that the level of targeted sequences (VL30 and -RVV) in the tested DNA sample was under the level of detection.

VL30γ-Retroviral vector
Sample #VCNStdVCNStd

#10.00020.00010.02490.0030
#20.00610.00040.05820.0029
#3NDND
#4NDND
#50.07030.00300.12740.0025
#60.07760.00570.14820.0023
#70.06760.00380.11780.0051
#80.00000.0000ND
#9NDND
#100.00010.0001ND
#110.00010.00010.00660.0001
#120.00250.00010.02860.0001
#130.00570.00040.05650.0036
−ContNDND