Figure 6.
DNA DSB assay. (A) Representative neutral elution profile for K562 cells treated with 0 (▪), 5 (▾), 10 (•), or 20 (♦) μM etoposide in the absence (black symbols) or presence (white symbols) of 10 μM NU7026 for 1 hour prior to neutral elution. (B) Mean relative elution values (calculated at 50% [3H] retention). □ indicates etoposide alone; and ▪, etoposide + NU7026. Results are means from 4 independent experiments ± SD. P values were calculated using the 2-tailed unpaired Student t test in order to determine whether DSB levels were significantly different in the presence of NU7026 (P = .01, 5.0 μM; P = .183, 10 μM; P = .06, 20 μM).