The NIH/NIST study examined four types of lesions in DNA from both cell nuclei and mitochondria, the energy factories of cells. The scientists discovered that prostate cancers cells unexposed to ionizing radiation had high degrees of free radical damage and defective restoration mechanisms. They also found that, after contact with ionizing radiation and a repair period, prostate tumor cells exhibited elevated levels of free radical damage and decreased removal of lesions. Related StoriesScientists discover little molecule that can block growth of BRCA-deficient cancers cellsNew results reveal association between colorectal cancer tumor and melanoma medication treatmentMeat-rich diet may increase kidney cancer riskProstate cancers is the most common type of malignancy among American males.This study is a follow-up to a 2011 study by Aronson and his group that found a low-fat diet with seafood oil supplements eaten for 4-6 weeks prior to prostate removal slowed the growth of tumor cells in human prostate cancer tissue compared to a normal, high-fat Western diet plan. That short-term research also discovered that the men on the low-fat seafood oil diet could actually switch the composition of their cell membranes in both the healthy cells and the cancer cells in the prostate.