Plasma GFAP also moderated the relationship between plasma p‐tau181 and AD meta‐ROI volume (T1–NMRI: β [95% CI] = −0.09 [−0.17, −0.01]; J–N threshold > 103 pg/mL), but the association did not survive FDR correction (uncorrected p = 0.040; FDR‐corrected p = 0.081). The gene discussed is GFAP; the disease is Alzheimer disease.