Curcumin pre-treatment sensitizes cells to radiation exposure and reduces the clonogenic potential of A2780CP cells. A2780CP cells were treated with the indicated amounts of curcumin or radiation alone or pre-treated with curcumin for 6 hrs followed by radiation exposure and allowed to grow for 8 days. (A) Representative images of colony forming assays. (B) Colonies were counted and expressed as a percent of each respective dose of radiation. Data represent mean of 3 repeats for each treatment (Mean ± SE; * p < 0.017, compared to the same dose of curcumin with no radiation exposure).