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Diabetes Mellitus, Type 1GDCNCT01055093

Prospective Study on Diabetes Mellitus and Its Complications in Newly Diagnosed Adult Patients

An observational study of Diabetes Mellitus, Type 1 and Diabetes Mellitus, Type 2, run by German Diabetes Center at 1 site in Germany.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

The aim of the prospective observational GDC-Study in patients with newly diagnosed diabetes mellitus aged 18-69 years at inclusion into the study is to characterize in detail the clinical, metabolical and immunological phenotype and monitor the progression of the disease and to compare the phenotype to glucose… Read more about this study

Who is it for?
Ages 18 to 69 yearsHealthy volunteers can take part
How many people
2,000 participants
Where
1 siteGermany
Study dates
Sep 2005to Sep 2040
Phase
Observational
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 69 years
  • All sexes
  • Healthy volunteers accepted
  • Adult, Older adult

Study population: Patients are recruited from the general populations by screening

Who may be able to join

  • Clinical diagnosis of diabetes mellitus according to ADA criteria
  • Age 18-69
  • Diabetes duration since diagnosis < 12 months
  • Control cohort: proven normal glucose tolerance according to ADA criteria

Who cannot join

  • Diabetes mellitus category 3 B-H (ADA criteria)
  • Pregnancy
  • Severe renal, liver or heart disease
  • malignant cancer
  • severe psychiatric illness or addiction
  • participation in an intervention trial

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Germany1 site, 1 recruiting
  • German Diabetes Center

    Düsseldorf, North Rhine-Westphalia, 40225

    Clinical Study Center, +49-211-3382-0 ext. -209, studienzentrum@ddz.de

    Michael Roden, Prof., MD

    Recruiting

Other trials in Germany

About this study

The aim of the prospective observational GDC-Study in patients with newly diagnosed diabetes mellitus aged 18-69 years at inclusion into the study is to characterize in detail the clinical, metabolical and immunological phenotype and monitor the progression of the disease and to compare the phenotype to glucose tolerant humans of similar age, body mass and sex distribution.

Read the detailed description

In detail, the following questions will be answered:

  1. Are there different phenotypes with respect to insulin secretion, insulin sensitivity, micro- and macrovascular status and diabetic neuropathy at time of diagnosis?
  2. Which factors modify the progression of the disease (Nutrition, subclinical inflammation, energy metabolism and physical activity)?
  3. Can we identify subgroups at baseline with different progression of the disease? Patients are thoroughly examined at baseline and after 2, 5, and 10 years with annual telephone contacts in between.
Keywords
diabetes mellitus, prospective observational study, diabetic complications
Medical subject headings
Diabetes Mellitus, Type 1, Diabetes Mellitus, Type 2, Diabetes Mellitus, Diabetes Complications

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

Study groups in NCT01055093
Study groupRoleWhat they receive
Diabetes CohortProspectively followed cohort of newly diagnosed patients with diabetes mellitus, aged 18-69 years at inclusion into the study
Control CohortProspectively followed cohort of glucose tolerant humans, aged 18-69 years at inclusion into the study

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change of insulin sensitivity (M-Value)

    measurement of whole body insulin sensitivity with hyperinsulinamic euglicamic clamp

    Measured: 2 and 5 years

Secondary outcomes (2)
  1. Change of insulin secretion

    measurement of insulin secretion with glucagon test, mixed-meal test and intravenous glucose tolerance test

    Measured: 2 and 5 years

  2. Incidence of any diabetic complication

    The prevalence of diabetic complications

    Measured: 2-10 years

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted25 Jan 2010 (estimated)
  2. Study startSep 2005
  3. Primary completionSep 2030 (estimated)
  4. Study completionSep 2040 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Cohort
Time perspective
Prospective
Enrolment
2,000 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT01055093
Sponsor's protocol ID
GDC-Study-01
Acronym
GDC
Status last verified
Jul 2025
First submitted
22 Jan 2010
Last updated
16 Jul 2025
Results posted
No

Publications

  • Szendroedi J, Saxena A, Weber KS, Strassburger K, Herder C, Burkart V, Nowotny B, Icks A, Kuss O, Ziegler D, Al-Hasani H, Mussig K, Roden M; GDS Group. Cohort profile: the German Diabetes Study (GDS). Cardiovasc Diabetol. 2016 Apr 7;15:59. doi: 10.1186/s12933-016-0374-9.

    PubMed 27053136
  • Kossler T, Bobrov P, Strassburger K, Kuss O, Zaharia OP, Karusheva Y, Moser C, Bodis K, Burkart V, Roden M, Szendroedi J; GDS Group. Impact of mixed meal tolerance test composition on measures of beta-cell function in type 2 diabetes. Nutr Metab (Lond). 2021 May 4;18(1):47. doi: 10.1186/s12986-021-00556-1.

    PubMed 33947421
  • Kupriyanova Y, Zaharia OP, Bobrov P, Karusheva Y, Burkart V, Szendroedi J, Hwang JH, Roden M; GDS group. Early changes in hepatic energy metabolism and lipid content in recent-onset type 1 and 2 diabetes mellitus. J Hepatol. 2021 May;74(5):1028-1037. doi: 10.1016/j.jhep.2020.11.030. Epub 2020 Nov 28.

    PubMed 33259845
  • Zaharia OP, Strassburger K, Knebel B, Kupriyanova Y, Karusheva Y, Wolkersdorfer M, Bodis K, Markgraf DF, Burkart V, Hwang JH, Kotzka J, Al-Hasani H, Szendroedi J, Roden M; GDS Group. Role of Patatin-Like Phospholipase Domain-Containing 3 Gene for Hepatic Lipid Content and Insulin Resistance in Diabetes. Diabetes Care. 2020 Sep;43(9):2161-2168. doi: 10.2337/dc20-0329. Epub 2020 Jun 19.

    PubMed 32910776
  • Maalmi H, Herder C, Strassburger K, Urner S, Jandeleit-Dahm K, Zaharia OP, Karusheva Y, Bongaerts BWC, Rathmann W, Burkart V, Szendroedi J, Roden M. Biomarkers of Inflammation and Glomerular Filtration Rate in Individuals with Recent-Onset Type 1 and Type 2 Diabetes. J Clin Endocrinol Metab. 2020 Dec 1;105(12):dgaa622. doi: 10.1210/clinem/dgaa622.

    PubMed 32879938
  • Kanti G, Anadol-Schmitz E, Bobrov P, Strassburger K, Kahl S, Zaharia OP, Sarabhai T, Karusheva Y, Burkart V, Markgraf DF, Trenkamp S, Ziegler D, Szendroedi J, Roden M; GDS Group. Vitamin B12 and Folate Concentrations in Recent-onset Type 2 Diabetes and the Effect of Metformin Treatment. J Clin Endocrinol Metab. 2020 Jun 1;105(6):dgaa150. doi: 10.1210/clinem/dgaa150.

    PubMed 32219330
  • Bodis K, Jelenik T, Lundbom J, Markgraf DF, Strom A, Zaharia OP, Karusheva Y, Burkart V, Mussig K, Kupriyanova Y, Ouni M, Wolkersdorfer M, Hwang JH, Ziegler D, Schurmann A, Roden M, Szendroedi J; GDS Study Group. Expansion and Impaired Mitochondrial Efficiency of Deep Subcutaneous Adipose Tissue in Recent-Onset Type 2 Diabetes. J Clin Endocrinol Metab. 2020 Apr 1;105(4):e1331-43. doi: 10.1210/clinem/dgz267.

    PubMed 31838512
  • Puttgen S, Bonhof GJ, Strom A, Mussig K, Szendroedi J, Roden M, Ziegler D. Augmented Corneal Nerve Fiber Branching in Painful Compared With Painless Diabetic Neuropathy. J Clin Endocrinol Metab. 2019 Dec 1;104(12):6220-6228. doi: 10.1210/jc.2019-01072.

    PubMed 31390004
  • Zaharia OP, Strassburger K, Strom A, Bonhof GJ, Karusheva Y, Antoniou S, Bodis K, Markgraf DF, Burkart V, Mussig K, Hwang JH, Asplund O, Groop L, Ahlqvist E, Seissler J, Nawroth P, Kopf S, Schmid SM, Stumvoll M, Pfeiffer AFH, Kabisch S, Tselmin S, Haring HU, Ziegler D, Kuss O, Szendroedi J, Roden M; German Diabetes Study Group. Risk of diabetes-associated diseases in subgroups of patients with recent-onset diabetes: a 5-year follow-up study. Lancet Diabetes Endocrinol. 2019 Sep;7(9):684-694. doi: 10.1016/S2213-8587(19)30187-1. Epub 2019 Jul 22.

    PubMed 31345776
  • Simon MC, Moller-Horigome A, Strassburger K, Nowotny B, Knebel B, Mussig K, Herder C, Szendroedi J, Roden MW; German Diabetes Study Group. Correlates of Insulin-Stimulated Glucose Disposal in Recent-Onset Type 1 and Type 2 Diabetes. J Clin Endocrinol Metab. 2019 Jun 1;104(6):2295-2304. doi: 10.1210/jc.2018-02057.

    PubMed 30689904
  • Rathmann W, Strassburger K, Bongaerts B, Kuss O, Mussig K, Burkart V, Szendroedi J, Kotzka J, Knebel B, Al-Hasani H, Roden M; GDS Group. A variant of the glucose transporter gene SLC2A2 modifies the glycaemic response to metformin therapy in recently diagnosed type 2 diabetes. Diabetologia. 2019 Feb;62(2):286-291. doi: 10.1007/s00125-018-4759-z. Epub 2018 Nov 9.

    PubMed 30413829
  • Grobosch S, Kuske S, Linnenkamp U, Ernstmann N, Stephan A, Genz J, Begun A, Haastert B, Szendroedi J, Mussig K, Burkart V, Roden M, Icks A; GDS Group. What information needs do people with recently diagnosed diabetes mellitus have and what are the associated factors? A cross-sectional study in Germany. BMJ Open. 2018 Oct 31;8(10):e017895. doi: 10.1136/bmjopen-2017-017895.

    PubMed 30385437
  • Schroder K, Szendroedi J, Benthin A, Gontscharuk V, Ackermann P, Volker M, Steingrube N, Nowotny B, Ziegler D, Mussig K, Geerling G, Kuss O, Roden M, Guthoff R; GDS Cohort. German Diabetes Study - Baseline data of retinal layer thickness measured by SD-OCT in early diabetes mellitus. Acta Ophthalmol. 2019 Mar;97(2):e303-e307. doi: 10.1111/aos.13851. Epub 2018 Sep 21.

    PubMed 30238609
  • van Gemert T, Wolwer W, Weber KS, Hoyer A, Strassburger K, Bohnau NT, Bruggen MA, Ovelgonne K, Gossmann EM, Burkart V, Szendroedi J, Roden M, Mussig K; GDS Group. Cognitive Function Is Impaired in Patients with Recently Diagnosed Type 2 Diabetes, but Not Type 1 Diabetes. J Diabetes Res. 2018 Aug 9;2018:1470476. doi: 10.1155/2018/1470476. eCollection 2018.

    PubMed 30159333
  • Ziegler D, Strom A, Kupriyanova Y, Bierwagen A, Bonhof GJ, Bodis K, Mussig K, Szendroedi J, Bobrov P, Markgraf DF, Hwang JH, Roden M; GDS Group. Association of Lower Cardiovagal Tone and Baroreflex Sensitivity With Higher Liver Fat Content Early in Type 2 Diabetes. J Clin Endocrinol Metab. 2018 Mar 1;103(3):1130-1138. doi: 10.1210/jc.2017-02294.

    PubMed 29267946

Questions about this trial

What is this clinical trial studying?

An observational study of Diabetes Mellitus, Type 1 and Diabetes Mellitus, Type 2, run by German Diabetes Center at 1 site in Germany.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 16 Jul 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Germany. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Robert Wagner, Prof., MD (+49-211-3382 ext. -277, robert.wagner@ddz.de), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change of insulin sensitivity (M-Value) (time frame: 2 and 5 years). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT01055093, which also lists 42 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 16 Jul 2025.

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