Clinical trials · California
Cystic Fibrosis clinical trials in California
We’re tracking 23 recruiting cystic fibrosis studies with a site in California — including Phase 1, Phase 2, Phase 2/Phase 3, Phase 3 and Phase 4 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT03839992Recruiting
Checks for hidden small airways blockage in cystic fibrosis
This trial looks for early, “hidden” breathing test abnormalities in people with cystic fibrosis who have normal routine lung test results. It may help researchers find blockage in smaller airways before it shows up on standard tests.
Lakewood, CaliforniaAges 5–40 - NCT05248230RecruitingPhase 2
Study drug for adults with cystic fibrosis lung disease
This Phase 2 trial tests 4D-710 to improve lung health in adults with cystic fibrosis who either cannot take CFTR modulator medicines or are not doing well enough on them. You may be eligible if you have moderate lung function and stable oxygen levels, and you meet other safety and health requirements.
San Francisco, CaliforniaAges 18 years+ - NCT06429176RecruitingPhase 2
SPL84 for cystic fibrosis with 3849+10kb mutation
This trial tests a new drug called SPL84 for people with cystic fibrosis who have a specific gene mutation (3849+10kb C->T). It aims to see if the drug is safe and can improve lung function. The study has two paths: one for people not taking certain CF drugs, and one for those who are already on Trikafta or Alyftrek.
Los Angeles, CaliforniaAges 18 years+ - NCT05548283RecruitingPhase 4
Standard IV antibiotic timing for cystic fibrosis lung flare-ups
This study standardizes how IV aminoglycoside antibiotics are given during a 14-day treatment for cystic fibrosis (CF) lung flare-ups. It may help make treatment more consistent and easier to manage for people who need IV antibiotics.
Orange, CaliforniaAges 6 years+ - NCT06747858RecruitingPhase 2
Testing a new inhaler medicine for cystic fibrosis
This study tests an experimental inhalable medicine called ARCT-032 for people with cystic fibrosis who cannot take or benefit enough from current CFTR modulators. The goal is to see if it safely improves lung function and quality of life.
Los Angeles, CaliforniaAges 18 years+ - NCT06837181Recruiting
Understanding diabetes complications in cystic fibrosis
This study looks at how long-term diabetes affects people with cystic fibrosis. It helps researchers understand complications and improve care.
Los Angeles, CaliforniaAges 12 years+ - NCT06559150RecruitingPhase 2
Study of ensifentrine for non-cystic fibrosis bronchiectasis
This trial tests an inhaled drug called ensifentrine in people with bronchiectasis (damaged, widened airways in the lungs). The goal is to see if it can reduce flare-ups and improve symptoms.
Los Angeles, CaliforniaAges 18–80 - NCT04469439Recruiting
Sinus surgery in adults with cystic fibrosis
This study looks at how endoscopic sinus surgery affects people with cystic fibrosis who have ongoing sinus problems even after medical treatments. It may help doctors understand whether surgery plus ongoing care improves symptoms and quality of life.
Los Angeles, CaliforniaAges 18–99 - NCT07275905RecruitingPhase 1
Phage therapy for adults with cystic fibrosis and achromobacter infection
This trial tests a cocktail of viruses (bacteriophages) that target achromobacter bacteria in the lungs of adults with cystic fibrosis. It aims to see if the phages are safe and can reduce the infection.
San Diego, CaliforniaAges 18 years+ - NCT06413368RecruitingPhase 2/Phase 3
Maralixibat for cystic fibrosis constipation
This trial tests a medicine called maralixibat to see if it helps children with cystic fibrosis who have chronic constipation that doesn't improve with standard treatments. The goal is to improve bowel movements and quality of life.
Los Angeles, CaliforniaAges 1–18 - NCT07048574Recruiting
Mood and behavior in children with cystic fibrosis
This study looks at mood and behavior in children with cystic fibrosis (CF) under 12. By following children over time, researchers hope to better understand and help with depression, anxiety, and behavior challenges that may come up.
Orange, CaliforniaAges 1.5 years–11 years - NCT05844449Enrolling by invitationPhase 3
Check long-term safety and effectiveness of CF medicines
This Phase 3 study looks at how well and how safely Vanzacaftor/Tezacaftor/Deutivacaftor works over the long term in people with cystic fibrosis who already took the study medicine before. It may help confirm the best long-term plan and spot important safety issues.
Orange, CaliforniaAges 1 year+ - NCT04930289Enrolling by invitation
Lung transplant registry for better donor lung preservation
This study builds a worldwide database to track and improve how donor lungs are preserved before transplant. Your information may help doctors choose and manage donor lungs more effectively.
Stanford, CaliforniaAges Any age - NCT05359991Recruiting
Exercise study in children and teens with lung or blood conditions
This study tests how safe and effective a structured exercise program is for children and teens. It also compares results between children with sickle cell disease, cystic fibrosis, and healthy peers (and some teens after COVID-19 infection).
Irvine, CaliforniaAges 10–17 - NCT06504589Recruiting
Study for CF treatments for people without modulators
This study tests new treatments for cystic fibrosis in people who cannot take or choose not to take current CFTR modulators. It aims to find better options for managing CF.
San Francisco, CaliforniaAges 12 years+ - NCT06539169Recruiting
Following people with rare diseases over time
This study follows people with rare diseases over time to learn more about how these conditions progress and how they are treated. Joining may help researchers understand your disease better and find better ways to care for others.
Los Altos, CaliforniaAges Any age - NCT04509050Recruiting
Testing a highly effective CF medicine in young children
This study looks at how well a highly effective cystic fibrosis (CF) medicine works in infants and young children, and what biological changes it causes. It may help families understand whether the medicine improves CF function and related measures early in life.
Palo Alto, CaliforniaAges Up to 10 years - NCT06603246RecruitingPhase 1
Study of inhaled GDC-6988 for mucus lung diseases
This study tests an inhaled medicine (GDC-6988) to see if it is safe and helps clear mucus from the lungs in people with mucus-related lung diseases like chronic bronchitis, COPD, or bronchiectasis. You may qualify if your lung function is fairly stable and you produce daily mucus.
Palo Alto, CaliforniaAges 18 years+ - NCT06654752Recruiting
Simpler treatment for lung flare-ups in kids with CF
This study tests a streamlined approach to managing sudden lung symptoms (pulmonary exacerbations) in children with cystic fibrosis. It aims to see if a simpler treatment plan works as well as standard care, which could mean less time in the hospital and fewer disruptions to daily life.
Los Angeles, CaliforniaAges 3–18 - NCT06998043RecruitingPhase 2
Phage therapy for cystic fibrosis with pseudomonas lung infection
This trial tests a new treatment using phages (viruses that kill bacteria) for people with cystic fibrosis who have a chronic pseudomonas lung infection. It aims to see if adding phages to your usual care can help control the infection.
Palo Alto, CaliforniaAges 18 years+ - NCT07312734Recruiting
Testing new ways to find lung germs in CF
This study tests a new method to detect bacteria in the lungs of people with cystic fibrosis (CF) by analyzing mucus samples. It aims to improve how we diagnose and treat lung infections.
La Jolla, CaliforniaAges 16 years+ - NCT07450547RecruitingPhase 2
A trial of a new medicine for cystic fibrosis and pancreatic problems
This trial tests a new medicine (ANG003) for people with cystic fibrosis who have severe pancreatic problems. It looks at how safe and effective the medicine is, and whether it helps with digestion.
Long Beach, CaliforniaAges 12 years+ - NCT06262282Enrolling by invitation
Phage therapy for stubborn NTM infection in cystic fibrosis
This trial tests whether a special virus therapy (phage) can help clear stubborn NTM lung infections in people with cystic fibrosis who have been on antibiotics for over a year without success. Participants will continue their antibiotics while receiving the phages.
Los Angeles, CaliforniaAges 6 years+
Cystic Fibrosis trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting cystic fibrosis studies listed above.
- Stanford University · 7 studies
- Children's Hospital Los Angeles · 5 studies
- University of California, San Francisco · 4 studies
- Children's Hospital of Orange County · 3 studies
- University of California San Diego Health · 3 studies
- Long Beach Memorial Medical Center · 2 studies
- University of California San Diego · 2 studies
- University of California, Davis Medical Center · 2 studies
What taking part in a cystic fibrosis study involves
A screening visit first
Before anything else, the study team checks whether you fit — usually a visit with some tests. You can stop at any point, and screening is typically free.
Care at a nearby site
Study visits happen at a clinic or hospital taking part. Many studies cover the cost of the study treatment and related visits, and some reimburse travel.
You stay in control
Taking part is voluntary and you can leave a study at any time, for any reason, without affecting your regular care.
The team decides eligibility
Our fit check is a helpful first read, not a decision. The study team makes the final call after reviewing your health history.
Cystic Fibrosis trials in other states
Common questions
- Are there cystic fibrosis clinical trials in California?
- Yes. We're currently tracking 23 recruiting cystic fibrosis studies with a site in California, each rewritten in plain language so you can see what it's testing and who it's for.
- How do I find out if I qualify for a cystic fibrosis study in California?
- Each study lists its eligibility rules — age, diagnosis, prior treatments. On every trial page we explain these in plain language and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Do I have to live in California to take part?
- Not necessarily. These studies have a site in California, but eligibility is about your health, not your address — some people travel to take part, and a few studies reimburse travel. The study team can tell you what's required.
- Does it cost anything to join a cystic fibrosis trial?
- Using Clin2 is always free. Many trials cover the study treatment and related visits; some reimburse travel. The study team explains exactly what's covered before you decide.
Not the right time?
New cystic fibrosis studies open in California regularly. Set up a health profile and we’ll quietly watch for studies that fit you and email you when one opens.
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.