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ClinicalTrials.gov public records Last synced Oct 21, 2026, 5:51 PM EDT

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Showing 1–24 of 163 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Stool and Blood Specimen Collection Clear all
Not listed No phase listed Observational Accepts healthy volunteers

Biomarker Study of Previously Treated Lyme Disease Volunteers in Comparison to Healthy Volunteers

NCT04835792
View directory record Official record
Conditions
Lyme Disease
Interventions
Stool and blood collection
Other
Lead sponsor
FlightPath Biosciences, Inc.
Industry
Eligibility
18 Years and older
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Apr 8, 2021 · Synced Oct 21, 2026, 5:51 PM EDT
Recruiting Not applicable Interventional

Effect of Meal Timing During Adjuvant Treatment for Cancer

NCT07524218
View directory record Official record
Conditions
Cancer
Interventions
Time-restricted eating, Questionnaire Administration, Biospecimen Collection, Health coaching
Behavioral · Other · Procedure
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 25, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Recruiting No phase listed Observational

Fatigue and Molecular Mechanisms in Cancer Patients Receiving CCRT

NCT06633224
View directory record Official record
Conditions
Cancer, Thoracic Cancer, Gynecologic Cancer, Head and Neck Cancer, Gastrointestinal Cancer
Interventions
Blood Specimen Collection, Stool Specimen Collection, Quality of Life (QOL) Questionnaires
Procedure · Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
125 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 15, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Recruiting Phase 2 Interventional

Fecal Microbiome Transplant to Remodel Intestinal Microbiota for Patients With Relapsed or Refractory Lymphoma With Exposure to High-Risk Antibiotics Who Are Receiving Chimeric Antigen Receptor T Cells

NCT07042438
View directory record Official record
Conditions
Recurrent Diffuse Large B-Cell Lymphoma, Recurrent High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements, Recurrent Transformed Follicular Lymphoma to Diffuse Large B-Cell Lymphoma, Refractory Diffuse Large B-Cell Lymphoma, Refractory High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements, Refractory Transformed Follicular Lymphoma to Diffuse Large B-Cell Lymphoma
Interventions
Axicabtagene Ciloleucel, Biospecimen Collection, Chemotherapy, Fecal Microbiota Transplantation, Leukapheresis, Placebo Administration
Biological · Procedure · Drug
Lead sponsor
City of Hope Medical Center
Other
Eligibility
18 Years and older
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Mar 5, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Active, not recruiting Phase 1 Interventional

Microbiota Transplant With Antibiotic Preconditioning and Fiber Supplementation in PAH.

NCT07751120
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
MTT with antibiotic preconditioning + fiber supplementation, MTT with antibiotic preconditioning + placebo supplementation, MTT with placebo + placebo supplementation.
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 75 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 28, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Recruiting No phase listed Observational

Evaluation of Anti-PD-1 Therapy by Monitoring T Cell Responses in Melanoma, Lung and Other Cancer Types

NCT06075524
View directory record Official record
Conditions
Clinical Stage III Cutaneous Melanoma AJCC v8, Clinical Stage IV Cutaneous Melanoma AJCC v8, Locally Advanced Lung Carcinoma, Locally Advanced Malignant Solid Neoplasm, Locally Advanced Melanoma, Metastatic Lung Carcinoma, Metastatic Malignant Solid Neoplasm, Metastatic Melanoma, Stage III Lung Cancer AJCC v8, Stage IV Lung Cancer AJCC v8
Interventions
Biospecimen Collection, Electronic Health Record Review
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2028
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 18, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Enrolling by invitation Phase 4 Interventional Accepts healthy volunteers

Imaging Biomarkers of Pancreatic Function and Disease

NCT05659147
View directory record Official record
Conditions
Pancreatitis, Diabetes Mellitus
Interventions
Research MRI without administration of intravenous secretin, Research MRI with administration of intravenous secretin, Genetic Sequencing, Blood Tests, Stool Tests, Survey Completion, Endoscopic pancreatic function tests (ePFTs), Secretin
Diagnostic Test · Genetic · Other + 1 more
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
5 Years to 21 Years
Enrollment
195 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 18, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Completed No phase listed Observational

A Study of Immune Responses to the Virus That Causes COVID-19

NCT04431414
View directory record Official record
Conditions
SARS-CoV-2, COVID-19
Interventions
Sample collection
Other
Lead sponsor
COVID-19 Prevention Network
Network
Eligibility
18 Years and older
Enrollment
953 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
15
States / cities
Birmingham, Alabama • San Francisco, California • Miami, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 26, 2022 · Synced Oct 21, 2026, 5:51 PM EDT
Completed Phase 2 Interventional Results available

The Effects of Patiromer on Serum Potassium Level and Gut Microbiome of ESRD Patients With Hyperkalemia

NCT03326583
View directory record Official record
Conditions
ESRD, Hyperkalemia, End Stage Renal Disease
Interventions
Patiromer
Drug
Lead sponsor
Dominic Raj
Other
Eligibility
18 Years to 85 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated May 9, 2023 · Synced Oct 21, 2026, 5:51 PM EDT
Suspended Phase 1 Interventional

Nivolumab and Ipilimumab With and Without Camu Camu for the Treatment of Patients With Metastatic Renal Cell Carcinoma

NCT06049576
View directory record Official record
Conditions
Clear Cell Renal Cell Carcinoma, Sarcomatoid Renal Cell Carcinoma, Stage III Renal Cell Cancer AJCC v8, Stage IV Renal Cell Cancer AJCC v8
Interventions
Biospecimen Collection, Bone Scan, Computed Tomography, Ipilimumab, Magnetic Resonance Imaging, Myrciaria dubia Prebiotic Supplement, Nivolumab
Procedure · Biological · Drug
Lead sponsor
City of Hope Medical Center
Other
Eligibility
18 Years and older
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Oct 8, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Interactions of Human Gut Microbiota With Intestinal Sweet Taste Receptors

NCT03032640
View directory record Official record
Conditions
Obesity
Interventions
Oral Glucose Tolerance Test (OGTT), Assessment of dietary compliance, Stool sampling, Sodium Saccharin, Placebo, Lactisole
Other
Lead sponsor
AdventHealth Translational Research Institute
Other
Eligibility
18 Years to 45 Years
Enrollment
102 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Feb 2, 2023 · Synced Oct 21, 2026, 5:51 PM EDT
Completed No phase listed Observational

Kids Intestinal Dysfunction in Congenital Heart Disease: the Kind Heart Study

NCT02824705
View directory record Official record
Conditions
Congenital Disease
Interventions
Congenital Heart Disease Surgery
Procedure
Lead sponsor
University of Arizona
Other
Eligibility
3 Days to 2 Years
Enrollment
53 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 28, 2021 · Synced Oct 21, 2026, 5:51 PM EDT
Active, not recruiting Phase 2 Interventional

Testing the Combination of Two Anticancer Drugs M1774 (Tuvusertib) and Avelumab to Evaluate Their Safety and Effectiveness in Treating Merkel Cell Skin Cancer, MATRiX Trial

NCT05947500
View directory record Official record
Conditions
Clinical Stage III Cutaneous Merkel Cell Carcinoma AJCC v8, Clinical Stage IV Cutaneous Merkel Cell Carcinoma AJCC v8, Locally Advanced Merkel Cell Carcinoma, Metastatic Merkel Cell Carcinoma, Refractory Merkel Cell Carcinoma, Unresectable Merkel Cell Carcinoma
Interventions
Avelumab, Biopsy Procedure, Biospecimen Collection, Computed Tomography, Magnetic Resonance Imaging, Positron Emission Tomography, Tuvusertib
Drug · Procedure
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
50
States / cities
Irvine, California • La Jolla, California • Los Angeles, California + 39 more
Source: ClinicalTrials.gov public record
Updated Jul 31, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Association Between Gut Microbiome and Dietary Determinants and Vaccine Response

NCT05239403
View directory record Official record
Conditions
Influenza
Interventions
Biospecimen Collection, Questionnaire Administration
Procedure · Other
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
74 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 12, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Completed No phase listed Observational

Immune Response Under Immunotherapy in Metastatic NSCLC: Sputum, Blood Samples and Microbioata Study

NCT04804137
View directory record Official record
Conditions
Non-squamous Lung Cancer, Metastatic Lung Cancer
Interventions
Blood, sputum, saliva, stool
Other
Lead sponsor
University Hospital, Tours
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 17, 2024 · Synced Oct 21, 2026, 5:51 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Collection of Blood, Bone Marrow, Skin, Saliva, and Stool Samples From Healthy Volunteers Used for Comparative Analysis of Myeloid Malignancies

NCT05588154
View directory record Official record
Conditions
Myelodysplastic Syndromes
Interventions
Not listed
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years to 120 Years
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2052
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Inflammation, Diabetes, Ethnicity and Obesity Cohort

NCT03022682
View directory record Official record
Conditions
Obesity, Diabetes Mellitus, Pre Diabetes
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 75 Years
Enrollment
350 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2029
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 8, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Suspended Not applicable Interventional

Ketogenic Dietary Intervention to Improve Response to Immunotherapy in Patients With Metastatic Melanoma and Metastatic Kidney Cancer

NCT06391099
View directory record Official record
Conditions
Clinical Stage IV Cutaneous Melanoma AJCC v8, Metastatic Cutaneous Melanoma, Metastatic Renal Cell Carcinoma, Stage IV Renal Cell Cancer AJCC v8
Interventions
Best Practice, Biospecimen Collection, Computed Tomography, Dietary Intervention, Educational Activity, Glucose Measurement, Ketone Measurement, Questionnaire Administration
Other · Procedure
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated May 26, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Congenital Heart Anomaly Risk in Maternal Enteroviral Infection and Diabetes

NCT04769167
View directory record Official record
Conditions
Congenital Heart Disease, Viremia, Virus Diseases, Enterovirus, Enterovirus Infections, Heart Defects, Congenital, Heart Diseases, Prenatal Infection, Diabetes, Diabetes Mellitus, Type 2, Diabetes Mellitus, Type 1, Diabetes Mellitus, Pregnancy in Diabetic, Pregnancy Complications, Prenatal
Interventions
Stool and Blood Specimen Collection, Follow-up Medical Record Review
Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
114 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
2
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 24, 2025 · Synced Oct 21, 2026, 5:51 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

COVID-19: Human Epidemiology and Response to SARS-CoV-2

NCT04375761
View directory record Official record
Conditions
Coronavirus Disease 2019 (COVID-19), SARS-CoV-2
Interventions
Collection of Biological Samples, Symptom and Exposure Surveys
Procedure
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
Not listed
Enrollment
5,599 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
20
States / cities
Aurora, Colorado • Washington D.C., District of Columbia • Chicago, Illinois + 8 more
Source: ClinicalTrials.gov public record
Updated Aug 6, 2025 · Synced Oct 21, 2026, 5:51 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Elucidation of Breast Milk Composition and Structure Over the First Year of Lactation: UC Davis Lactation Study

NCT01817127
View directory record Official record
Conditions
Healthy, Gestational Diabetes Mellitus, Type 2 Diabetes Mellitus
Interventions
Not listed
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
395 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2028
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Dec 15, 2025 · Synced Oct 21, 2026, 5:51 PM EDT
Recruiting Not applicable Interventional

Engagement of American Indians of Southwestern Tribal Nations in Cancer Genome Sequencing

NCT06207864
View directory record Official record
Conditions
Malignant Neoplasm
Interventions
Biospecimen Collection, Return of Results, Survey Administration
Procedure · Other
Lead sponsor
New Mexico Cancer Research Alliance
Other
Eligibility
18 Years and older
Enrollment
1,001 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Oct 20, 2026 · Synced Oct 21, 2026, 5:51 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

AI-EMERGE: Development and Validation of a Multi-analyte, Blood-based Colorectal Cancer Screening Test

NCT03688906
View directory record Official record
Conditions
Colo-rectal Cancer, Cancer Colon, Cancer, Rectum, Neoplasms,Colorectal, Polyps, Polyp of Colon, Adenoma, Adenoma Colon
Interventions
Not listed
Lead sponsor
Freenome Holdings Inc.
Industry
Eligibility
18 Years and older
Enrollment
3,275 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
29
States / cities
Huntsville, Alabama • Chandler, Arizona • Tucson, Arizona + 25 more
Source: ClinicalTrials.gov public record
Updated Mar 2, 2022 · Synced Oct 21, 2026, 5:51 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Microbiome and Axial Spondyloarthritis

NCT04713995
View directory record Official record
Conditions
Axial Spondyloarthritis
Interventions
Dietary recommendations
Other
Lead sponsor
Viome
Industry
Eligibility
18 Years and older
Enrollment
95 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Bothell, Washington
Source: ClinicalTrials.gov public record
Updated Jul 8, 2022 · Synced Oct 21, 2026, 5:51 PM EDT