Several Immune Tolerance Network (ITN) drug treatment studies have been completed and have shown that some participants with new onset T1DM had partial disease remissions with therapy. Prior participants in these trials, had measured insulin secretion, at six month intervals, up to two years after diabetes diagnosis. It is unclear, however, if any of the interventions have produced a continuing disease remission in patients. For persons who have completed drug treatment trials, longer term follow-up is important for continued evaluation for effect of therapy on insulin production.