In AT patients, TNF-α mean values were 0.5 (0.7), 0.35 (0.6), 0.7 (0.7), and 0.12 (0.4) pg/mL, respectively in HP+, HP−, HP+/CagA+ and HP+/CagA− patients. The gene discussed is TNF; the disease is ataxia telangiectasia.