Clinical trials
Observational Study clinical trials
Below are recruiting observational study clinical trials, each written for real people, not researchers. We’re tracking 836 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06889844Recruiting
Blood test for colorectal cancer cross-reactivity study
This research study uses a blood test to look for signs of colorectal cancer in people who have other types of cancer or digestive diseases. The goal is to see if the test can correctly tell the difference between colorectal cancer and other conditions.
Málaga, AndalusiaAges 18 years+ - NCT06926244Recruiting
Studying resistance to IgA nephropathy treatments in real life
This study observes how people with IgA nephropathy respond to standard and newer treatments in everyday medical practice, to understand why some cases are resistant to therapy.
ParisAges 18 years+ - NCT07211321Recruiting
Diet, inflammation, and muscle loss in older adults
This study looks at how diet and gut health relate to muscle loss (sarcopenia) in adults 60 and older. It aims to understand links between inflammation, gut bacteria, and muscle strength so we can find better ways to prevent frailty.
Lanzhou, GansuAges 60 years+ - NCT07359183Recruiting
Long-term follow-up of kids who had oral immunotherapy for allergies
This study checks on children and young people 5 to 15 years after they finished an 18-month oral immunotherapy treatment for peanut, egg, or milk allergy. It helps researchers understand how their allergies and health are doing over the long term.
Parkville, VictoriaAges Any age - NCT01719055Recruiting
Long-term follow-up for Boston Scientific pain nerve stimulation
This study looks at how well a Boston Scientific nerve stimulation device works over the long term for pain in everyday care. You may be able to join if you’re already being set up to use one of these approved systems and can reliably report your pain outcomes.
Phoenix, ArizonaAges 18 years+ - NCT07399808Recruiting
CDK4/6 Inhibitors in Older Breast Cancer Patients
This study looks at how well CDK4/6 inhibitors work in older adults with breast cancer who are taking these drugs after surgery to help prevent the cancer from coming back. It will follow patients over time to learn more about their experiences.
Pavia, PaviaAges 18 years+ - NCT07611396Recruiting
Study of brain changes in memory and thinking with aging
This study follows people with normal thinking, early memory problems, or Alzheimer's disease to understand how the brain changes over time. Researchers will use smell tests, blood work, and memory testing to learn more about these conditions and potentially help future treatments.
Germantown, MarylandAges 55 years+ - NCT04534413Enrolling by invitation
Test lung cancer samples outside the body during surgery
This study looks at lung cancer tissue after surgery, using lab testing done outside the body. It may help researchers better observe and study lung tumors using samples taken during lobectomy or segment removal.
Toronto, OntarioAges 18 years+ - NCT06965335Recruiting
Early-onset colorectal cancer study
This study looks at colorectal cancer that starts early in life (ages 18–40). It compares it to the same cancer in people over 60 to find differences. You can join if you have had colorectal cancer and can provide a sample of your tumor.
Milan, MilanoAges 18–40 - NCT07048561Recruiting
Fitness and thinking skills in older adults
This study looks at how physical fitness connects to thinking skills like planning and memory in older adults. If you join, you will complete fitness tests and thinking tasks to help researchers understand this link.
TaipeiAges 65 years+ - NCT06870981Recruiting
Optimizing nutrition and milk in infants (Opti-NuM)
This study looks at stored information and samples from babies who were part of earlier MaxiMoM nutrition trials. It aims to learn more about how nutrition and milk feeding affect infant health.
Palo Alto, CaliforniaAges 1 hour–3 weeks - NCT07398222Recruiting
Stomach contents in tirzepatide users and fasting volunteers
This study uses an ultrasound to look at the stomach contents of people who are taking tirzepatide compared to those who are not. It will help doctors understand how this medication affects stomach emptying during fasting.
São Paulo, São PauloAges 18 years+ - NCT04613921Recruiting
Liver transplant study for severe worsening liver failure
This study looks at when liver transplant is offered and what outcomes happen in people with cirrhosis who have severe “acute-on-chronic” worsening. It may help doctors decide which patients benefit most from transplant and improve care after listing or not listing.
Los Angeles, CaliforniaAges 18–80 - NCT05853796Recruiting
Studying stroke warning signs in young adults
This observational study follows people ages 18–50 who had a first TIA (“mini-stroke”) or an acute ischemic stroke to better understand what happens after the event. It may help improve future care by tracking symptoms, imaging findings, and recovery over time.
Nijmegen, GelderlandAges 18–50 - NCT06607471Recruiting
Study on non-ischemic heart muscle diseases
This study looks at different types of heart muscle diseases that are not caused by blocked arteries (non-ischemic cardiomyopathies). It aims to better understand how to diagnose, predict outcomes, and treat these conditions by gathering information from many patients over time.
Milan, MilanoAges 18 years+ - NCT06928519Recruiting
Entacapone with Madopar for early Parkinson's
This study tests whether adding entacapone to Madopar (a common Parkinson's medication) safely improves symptoms in people with early-stage Parkinson's. It aims to see if the combination works better than Madopar alone.
Nanning, GuanxiAges 18–80 - NCT07160088Recruiting
Study of delayed brain injury after aneurysm bleed
This study follows people with a brain bleed from a ruptured aneurysm in real-world hospital settings. It aims to better understand delayed brain damage after the bleed, which could help improve care.
Beijing, Beijing MunicipalityAges 18–90 - NCT07236541Recruiting
Mucus plugs and lung scarring in COPD patients having lung cancer surgery
This study looks at whether mucus plugs (thick mucus blocking the airways) in people with COPD might lead to more lung scarring after lung cancer surgery. It compares lung tissue from people with COPD to those with normal lungs.
ShanghaiAges 18–89 - NCT07273422Recruiting
Smart insoles study for healthy adults
This trial is testing a new smart insole that tracks your body's signals while you walk. You'll visit the study center once a week for 4 weeks to test the insoles.
Williamsport, PennsylvaniaAges 18–90 - NCT07356544Recruiting
HER2 mutations in advanced non-small cell lung cancer
This study is looking at how common HER2 gene changes are in people with advanced non-small cell lung cancer (NSCLC) and how these changes affect treatment. By joining, you help researchers learn more about personalized care for this type of lung cancer.
Bari, BAAges 18 years+ - NCT07358078Recruiting
Long-term study of ATTR-CM patients on vutrisiran or other approved therapies
This study observes people with ATTR-CM (a heart condition caused by a protein called transthyretin) who are starting treatment with vutrisiran or another approved therapy. It aims to understand how the disease progresses and how treatments work in real life.
Naples, FloridaAges 18 years+ - NCT06726720Recruiting
Real-world study of approved lung cancer drugs
This study looks at how well approved AstraZeneca drugs work for non-small cell lung cancer in everyday medical practice. It does not test new treatments, but gathers information to help doctors and patients make better decisions.
Aix-en-ProvenceAges 18 years+ - NCT04388943Recruiting
BRICCS study: health data for cardiovascular research
This trial helps researchers study heart (cardiovascular) conditions using information collected about your care. It may help improve how doctors understand and treat cardiovascular diseases over time.
LeicesterAges 18–90 - NCT06232772Recruiting
Biomarkers for early Parkinson's diagnosis
This study looks for new markers in the blood or other samples to help diagnose Parkinson's disease earlier. It compares people with Parkinson's, related conditions (like multiple system atrophy or progressive supranuclear palsy), and healthy volunteers to find differences.
Nanning, GuangxiAges 18–80
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Common questions
- Are there clinical trials for observational study?
- Yes. Clin2 currently lists 836 recruiting observational study studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a observational study trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a observational study trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.