Fig 1. Effect of celecoxib and radiation on the cell viability was measured by CCK-8 assay.

(A) Celecoxib shows no cytotoxicity at 5 μM concentration. (B) A549, (C) H1299, (D) L78 and (E) PGCL3 cells were treated with different concentrations of Celecoxib and then irradiated 24 h for indicated times. Data were shown as the means ± S.D. of three independent experiments. ***P<0.001, **P<0.01 and *P<0.05 indicated significant difference between radiation alone with radiation plus Celecoxib groups.