Analysis of S100A8/A9 levels in saliva revealed no significant difference of the S100A8/A9 level in patients with AT (19480 ± 6920 ng/ml, p = 0.08) or PC (14110 ± 6220 ng/ml, p = 0.265) in comparison to the control group (4940 ± 1980 ng/ml). The gene discussed is S100A8; the disease is ataxia telangiectasia.