PRKDC and dementia: Levels of γH2AX+ and DNA‐PKcs+ neurones were higher in cases with dementia but did not reach significant levels (P = 0.11 for γH2AX+ neuronal counts, P = 0.31 for proportion of γH2AX+ neurones, P = 0.08 for DNA‐PKcs+ neuronal counts, P = 0.11 for proportion of DNA‐PKcs+ neurones) (Figure 3C,D).