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DNA-dependent protein kinase catalytic subunit(DNA-PKcs)plays a critical role in non-homologous end joining(NHEJ)of DNA double-stand break(DSB)repair.Previously,we found genistein could sensitize cancer cells to low linear energy transfer(LET)X-rays via inhibiting DNA-PKcs activities.Especially,high-LET heavy ion produces more DNA DSBs than low-LET radiation.