Significant differences in TNF-α levels were neither observed between the two ADHD presentations (5.7 ± 7.85 pg/mL in ADHD-AD vs. 5.76 ± 6.24 pg/mL in ADHD-C), nor in relation to the presence of ODCD within each ADHD subtype. The gene discussed is TNF; the disease is attention deficit-hyperactivity disorder.