The number of HD patients with measurable responses at 3D increased to 31 (97%) for CD8+ T cells (median, 0.19%; IQR 0.07–0.71%), 31 (97%) for CD4+ T cells (median, 0.54%; IQR 0.21–0.88%), and 31 (97%) for both T-cell subsets. This evidence concerns the gene CD4 and Huntington disease.