- ICH GCP
- 미국 임상 시험 레지스트리
- 임상시험 NCT00633763
PET-CT Scan Method to Monitor Pancreatic B-Cell Loss in Diabetes Mellitus
The pancreas is an organ that plays major roles in the digestion of food. A part of the pancreas called islet beta-cells produces insulin, which regulates the amount of glucose (a sugar) present in the blood at all times. Type-1 Diabetes Mellitus (T1DM), an autoimmune disorder characterized by destruction of pancreatic islet beta-cells (the cells that produce insulin), affects at least a million individuals in the US alone. In T1DM, a type of white blood cells called T lymphocytes attacks and destroys the pancreatic islet beta-cells, leading to a loss of insulin, an increase in blood glucose, and a dependence on insulin injections for survival. Despite rigorous control of blood sugar, the majority of diabetic patients develop serious complications including retinopathy, nephropathy, neuropathy, microangiopathy and strokes.
Non-invasive methods to monitor pancreatic beta-cell loss associated with type-1 diabetes mellitus (T1DM) could improve early diagnosis, provide tools to measure responsiveness to new therapies, and evaluate the efficiency of pancreatic transplantation and graft survival.
Our goal is to develop a non-invasive PET-CT imaging method based on binding of a molecule (18F-fallypride) for tracking beta-cell loss during the progression of T1DM. In preliminary studies we demonstrated specific binding of 18F-fallypride to D2 receptors in rat pancreatic sections and we demonstrated that the loss of pancreatic beta cells in streptozotocin-treated rats was associated with a corresponding decrease in 18F-fallypride binding to pancreatic sections. A preliminary 18F-fallypride PET-CT study done by a collaborator in Ohio on a healthy volunteer, revealed 18F-fallypride-uptake by the pancreas that was distinguishable from surrounding tissues. Aim-1 of our project will measure the variability of 18F-fallypride PET-scanning of the pancreas in six healthy volunteers scanned twice with an interval of 4-6 weeks. In Aim-2 of our project, we will compare fallypride PET-CT scans of 12 patients with long-standing T1DM (nearly all beta cells destroyed) with 12 age- and sex-matched healthy volunteers. If we are able to distinguish between the two groups, we will in future (a) optimize the method so as to be able to detect a 20-30% loss of beta cells, and (b) perform PET-CT studies in new-onset T1DM patients and in at-risk first degree relatives of T1DM patients.
연구 개요
연구 유형
등록 (예상)
연락처 및 위치
연구 장소
-
-
California
-
Orange, California, 미국, 92868
- University of California Irvine Medical Center
-
-
참여기준
자격 기준
공부할 수 있는 나이
건강한 자원 봉사자를 받아들입니다
연구 대상 성별
샘플링 방법
연구 인구
설명
Inclusion Criteria:
- T1DM patients that are over 18 years of age, have had T1DM for greater than 5 years and show a greater than 80% reduction in C-peptide blood levels following intravenous glucagon injection are eligible to participate in this study.
- Healthy controls that are over 18 years of age, show normal C-peptide blood levels following intravenous glucagon injection, and are age- and sex-matched with one of the T1DM patients included in the study, are eligible to participate in this study.
Exclusion Criteria:
- T1DM patients or healthy controls that are not over 18 years of age are not eligible to participate in this study.
- Pregnant females are not eligible to participate in this study because there is a chance PET/CT scans might be risky for the developing baby. Females physically capable of getting pregnant will be required to get a urine pregnancy test at no cost before each of the PET/CT scans. If the pregnancy test is positive, the T1DM patient or healthy control will be excluded from the study. The consent form describes the risks in detail and the need for women of childbearing age to undergo a pregnancy test.
- Subjects with a history of psychiatric illness, substance abuse history, clinically significant head trauma, active neurological disease, cardiovascular disease, liver disease or renal impairment, claustrophobia ((very upset and afraid of being in a small space) are not eligible for the study. Dr. Ping Wang will use the subjects history, blood chemistry, to identify individuals with cardiovascular disease, liver disease, or renal impairment.
- T1DM patients with C-peptide levels following intravenous glucagon injection that are not reduced greater than 80% are not eligible for the study.
- Healthy volunteers with C-peptide levels following intravenous glucagon injection that are reduced greater than 20% compared to established control values are not eligible for the study.
- To determine if it is safe to do the procedure, T1DM patients and healthy volunteers will be expected to tell the researchers about any radiation exposure the individual may have had (including diagnostic or treatment x-rays), and any history of head injury, kidney or bladder disease, or any other serious medical conditions.
- T1DM patients and healthy volunteers will be expected to tell the researchers if they have surgical clips or metallic prostheses (i.e., replacement body parts, such as a hip joint) or a pacemaker or other pieces of metal in the body (shrapnel, metal filings, etc.).
- Patients with history of alcoholism or significant alcohol consumption will be excluded from the study.
- The consent form will be English, and non-English speakers will therefore be excluded from the study.
- Pregnant women are excluded because 18F-fallypride is a radioactive substance , which will be injected into the patient and could be hazardous to the fetus.
공부 계획
연구는 어떻게 설계됩니까?
디자인 세부사항
- 관찰 모델: 케이스 컨트롤
- 시간 관점: 유망한
코호트 및 개입
그룹/코호트 |
개입 / 치료 |
---|---|
1
Healthy individuals with normal C-peptide levels following i.v.
glucagon challenge.
These individuals will be administered 18F-fallypride and then subjected to PET-CT scanning of the pancreas and brain.
The subject will be positioned in the PET/CT scanner and a low-dose CT (15-20 secs) of the abdomen carried out (with subjects breathing normally).
A 30-min PET acquisition will then be started (three 10 min static frames or one 30 min static frame).
The subject will then be repositioned for a low-dose CT scan of the head (15-20 secs) following which a 20-min PET acquisition will then be started (two 10 min static frames or one 20 min static frame).
|
Single bolus i.v.
injection 60 minutes before PET-CT scanning.
Maximum activity per single administration 5 mCi; maximum amount of drug per administration <10 micrograms.
I.v.
bolus maximum activity per single administration 5 mCi; maximum amount of drug per administration <10 micrograms.
|
2
Patients with longstanding T1DM and <20% C-peptide levels following i.v.
glucagon challenge will be consented.
18F-Fallypride injected intravenously and subjects allowed to wait for approx 1 hr for the uptake.(b)
Subject positioned in the PET/CT scanner and a low-dose CT (15-20 secs) of the abdomen (pancreas) carried out (with subjects breathing normally).(c)
A 30-min PET acquisition will then be started (three 10 min static frames or one 30 min static frame).(d)
Subject repositioned for a low-dose CT scan of the head (15-20 secs).(e)
A 20-min PET acquisition will then be started (two 10 min static frames or one 20 min static frame).(f)
End of PET/CT scanning procedures.
Subject taken out of the scanner.
|
Single bolus i.v.
injection 60 minutes before PET-CT scanning.
Maximum activity per single administration 5 mCi; maximum amount of drug per administration <10 micrograms.
I.v.
bolus maximum activity per single administration 5 mCi; maximum amount of drug per administration <10 micrograms.
|
연구는 무엇을 측정합니까?
주요 결과 측정
결과 측정 |
기간 |
---|---|
Difference in fallypride binding in the pancreas of long-standing T1DM patients versus healthy controls
기간: At the end of the study when 12 controls and 12 patients have been studied.
|
At the end of the study when 12 controls and 12 patients have been studied.
|
공동 작업자 및 조사자
수사관
- 수석 연구원: George K Chandy, MD, PhD, University of California, Irvine
연구 기록 날짜
연구 주요 날짜
연구 시작
기본 완료 (실제)
연구 완료 (실제)
연구 등록 날짜
최초 제출
QC 기준을 충족하는 최초 제출
처음 게시됨 (추정)
연구 기록 업데이트
마지막 업데이트 게시됨 (추정)
QC 기준을 충족하는 마지막 업데이트 제출
마지막으로 확인됨
추가 정보
이 연구와 관련된 용어
추가 관련 MeSH 약관
기타 연구 ID 번호
- 2007-5785
이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .
18F-fallypride에 대한 임상 시험
-
Genentech, Inc.완전한
-
Chang Gung Memorial Hospital모병
-
British Columbia Cancer Agency더 이상 사용할 수 없음
-
Sanjiv Sam Gambhir완전한