Figure 2.

The radiation response modifying effects of a 5 mM dose of metformin on SA-NH and FSa tumor cells following an exposure of 30 min or 1 h administered prior to irradiation with a single 4 Gy dose. Each experiment was repeated three times and error bars represent the SEM. P values comparing cell survival at 4 Gy only to those following treatment with metformin are presented for comparison.