Furthermore, GAP-43 was found to be correlated with smaller ventricular volumes in CN ε4−, MCI ε4−, MCI ε4+, and AD ε4+ groups (β = −0.287, p < 0.001; β = −0.139, p = 0.027; β = −0.279, p < 0.001; β = −0.228, p = 0.027; respectively). The gene discussed is GAP43; the disease is Alzheimer disease.