Provided herein are methods of administering ISIS 443139 for ameliorating Huntington's disease, reducing HTT RNA, reducing mHTT RNA, reducing HTT protein, or reducing mHTT protein in a human subject in need thereof. In certain instances, methods are useful for ameliorating at least one symptom of Huntington's disease. Such symptoms of Huntington's disease include, but are not limited to, brain atrophy, muscle atrophy, nerve degeneration, uncontrolled movement, difficulty swallowing, difficulty speaking, anxiety and depression.