A Phase 2 interventional study of Recombinant human growth hormone in Gulf War Syndrome and Adult Growth Hormone Deficiency, sponsored by Baylor College of Medicine. Recruiting at 2 sites in United States. Open to participants aged 18 Years to 64 Years. Per ClinicalTrials.gov, last updated 2026-05-08.
Sponsored by Baylor College of Medicine · Phase 2, Interventional, and Treatment
The goal of the GWIT Study is to assess whether growth hormone replacement therapy is a safe and effective treatment for veterans with Gulf War Illness (GWI) and adult growth hormone deficiency (AGHD). The main questions the study aims to answer are:
To determine eligibility for the study, veterans will be asked to complete several assessments including questionnaires, blood tests, and a scan of the brain. Participants who qualify for the study will receive recombinant human growth hormone for 6-months. A body composition scan will be performed at Day1, Day 90, and Day 180 of the intervention. Questionnaires and cognitive tests will also be collected before and after the trial.
Veterans with Gulf War Illness (GWI) often experience a range of debilitating symptoms, including fatigue, chronic pain, depression, anxiety, and cognitive dysfunction. The factors contributing to these symptoms remain poorly understood, but adults with adult growth hormone deficiency (AGHD) experience similar symptoms. Growth hormone replacement therapy has been shown to improve fatigue, chronic pain, mood, cognitive function, and quality of life. Approximately 1 in 3 Veterans diagnosed with GWI also tests positive for AGHD, raising the question of whether growth hormone replacement therapy (GHRT) could be a potential avenue for improving their quality of life.
The objective of this research is to conduct a clinical trial to determine whether GHRT can improve body composition, cognitive function, sleep quality, fatigue, and mood in Veterans with GWI and AGHD. Data from this study will also provide important information on the safety of the intervention.
This research has the potential to reshape our understanding of GWI and its therapeutic management. If GHRT proves efficacious, it could prompt widespread screening and treatment for growth hormone deficiency among Gulf War Veterans, potentially ameliorating their symptoms and enhancing their functional recovery. Furthermore, the findings of this study may influence clinical practice guidelines, facilitating more effective communication and collaboration among Veterans, caregivers, researchers, and healthcare providers.
38 studies on the registry are indexed under Persian Gulf Syndrome; 10 are open to participants now.
This study's planned enrollment of 20 is below the median of 75 across 28 interventional studies indexed under Persian Gulf Syndrome.
Browse Persian Gulf Syndrome studies →Baylor College of Medicine is the lead sponsor of 734 studies on the registry; 110 are open to participants now.
Of its 83 completed or terminated interventional studies of FDA-regulated products, 44 (53%) have results posted.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
15) currently enrolled in any other interventional drug trials unless prior approval is provided by the study chairs and the study sponsor
Patients will be started at a dose of 200-300 mcg/d of daily injections of GHRT. A biweekly titration period of 6 weeks will be performed in increments of 100 mcg/d as needed until IGF-1 levels are between +1 and +2 standard deviation score, up to a maximum dose of 2,000 mcg/d, provided the dose is well tolerated. The duration of the intervention is 6-months. Participants will complete in-clinic follow-up visits at Days 14, 40, 65, 90, and 180. The primary outcome will be the change in truncal fat mass percentage from baseline to six months measured by dual-energy x-ray absorptiometry (DEXA).
Drug: Recombinant human growth hormone
recombinant human growth hormone (rhGH)
Also known as: Somatropin, Genotropin, Humatrope, Norditropin
Change in truncal fat mass from baseline to six months
The primary outcome measure is the difference of truncal fat mass percentage from baseline to six months. Truncal fat mass will be assessed at baseline, 3-months, and 6-months using calibrated dual energy x-ray absorptiometry (DEXA). A large mean difference corresponds with greater changes in truncal fat mass. Decreased truncal fat mass is associated with reduced risk of cardiovascular disease.
Time frame: 6 months
Cardiometabolic Risk Factors
Change in cardiometabolic risk factors from baseline to 6 months measured by fasting low density lipoproteins (LDL) and highly sensitive C-reactive protein levels. A decrease in lipoprotein corresponds with increased lipoprotein metabolism, and lower C-reactive protein levels corresponds with less inflammation. A reduction in both suggests lower risk of cardiometabolic disease.
Time frame: 6 months
Lean body mass
The change in appendicular lean body mass between baseline and 6 months will be assessed using calibrated dual energy x-ray absorptiometry. The difference will capture changes in body composition (fat and muscle) with a higher difference corresponding with greater body composition changes.
Time frame: 6 months
Assessment of quality of life
Change in the quality of life from baseline to 6 months will be measured by the Quality of Life questionnaire for Adult Growth Hormone Deficiency. The score ranges from 0 to 25, with a score of 25 representing highest symptomatic burden and lower quality of life. A change in score is positively correlated with the patient's perception of treatment benefit, and a score change of 3.5 points is considered clinically meaningful.
Time frame: 6 months
Fatigue
Fatigue will be measured using the Fatigue Severity Scale. The questionnaire minimum score is a 9 and maximum score is 63. Higher scores represent greater fatigue severity.
Time frame: 6 months
Depression, Anxiety, and Stress
The Depression, Anxiety, and Stress Scale-21 (DASS-21), a 21-item questionnaire, will be used to assess depression, anxiety, and stress symptoms. The score range is 0 - 126 with a higher score representing greater severity or frequency of negative emotional symptoms.
Time frame: 6 months
Pain Intensity and Interference
Pain intensity and interference will be assessed using the Defense and Veterans Pain Rating Scale. The questionnaire contains two sections, one assessing current level of pain and the other evaluating the extent to which pain interferes with biopsychosocial factors such as daily activity, sleep, mood, and stress. The minimum score for each section is 0 and maximum score is 10 where higher scores correspond with more intense pain and greater interference.
Time frame: 6 months
Plan to share: Yes — The data supporting the findings in this study may be made available upon request to VA and non-VA researchers in accordance to VA policy.
No publications or documents are linked to this record.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Baylor College of Medicine