Tumor incidence was increased significantly in hypoxic GRPs group as compared with parental cell group with 1×101 cells/injection, p<0.05.
To evaluate the in vivo tumorigenic potential, 1×10 cells or 1×102 cells of parental PC9 cells or normoxic and hypoxic PC9 GRPs were mixed with Matrigel and injected into both flanks of NOG mice. Tumor formation was evaluated 33 days after injection.