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All 3 Phelan-McDermid Syndrome trials and their US sites
Enter your ZIP code above to sort them by how far their nearest open site is from you.
- A Study of NNZ-2591 in Pediatric Participants With Phelan-McDermid SyndromeMost sites in California, Massachusetts and OhioRecruitingPhase 3Ages 3-12Neuren Pharmaceuticals17US sites
12 states - An Open-label Study of NNZ-2591 in Pediatric Participants With Phelan-McDermid SyndromeMost sites in California, Massachusetts and AlabamaRecruitingPhase 3Ages 3-12Neuren Pharmaceuticals12US sites
9 states - JAG201 Gene Therapy Study in Children & Adults With SHANK3 HaploinsufficiencyMost sites in Illinois, Massachusetts and New YorkRecruitingPhase 1/2Ages 2-9Jaguar Gene Therapy3US sites
3 states
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Who runs the Phelan-McDermid Syndrome trials in the US, and what stage they are in
Of the 3 Phelan-McDermid Syndrome trials with a US site, 2 are in Phase 3, the last stage before a company can ask the FDA for approval. One more is an earlier Phase 1 or 2 test of safety and dosing. Companies run all of them, with none led by a university, hospital or government group. Neuren Pharmaceuticals runs the most, with 2. The most recently listed one first appeared on ClinicalTrials.gov on May 18, 2026.
Phelan-McDermid Syndrome trials in the US, state by state
All 3 Phelan-McDermid Syndrome trials with a US site accept children under 18. Their open sites are in 11 states and Washington, DC, most often Illinois, Massachusetts and New York. A trial counts once in each state where it has an open site, and some trials accept both children and adults.
Show the other 2 states
US hospitals running the most Phelan-McDermid Syndrome trials
Centers that run trials for a rare condition often see more people with it than most clinics do, so this list can also help you find doctors who know Phelan-McDermid Syndrome.
- Boston Children's HospitalBoston, Massachusetts1 trial
- Rush UniversityChicago, Illinois1 trial
- Seaver Autism Center at Mount SinaiNew York, New York1 trial
Help getting to a Phelan-McDermid Syndrome trial far from home
Ask the study team whether the trial pays back travel, parking and hotel costs, because many sponsors do. The FDA's guidance on paying research volunteers says paying back these costs does not count as pressuring someone to join.
These nonprofits also help patients reach care, and each one sets its own rules.
- Mercy Medical Angels
- Pays for gas cards, ground rides and airline tickets anywhere in the US, and it lists clinical trials as a reason to travel. Household income at or below 300% of the federal poverty guidelines, and usually a trip of 50 miles or more each way.
- Air Charity Network
- Volunteer pilots in all 50 states fly patients for free in small private planes, and members also fly people taking part in clinical trials. You must be able to walk and sit upright for the flight, show financial need and have a backup plan if weather cancels it.
- Ronald McDonald House
- Gives families a room near the hospital while a child gets care, through 394 House programs around the world. Families of a sick child, with rules set by each local chapter.
- Healthcare Hospitality Network
- Keeps a map of hospitality houses near hospitals, and most member houses charge little or nothing to patients and families. Each house sets its own rules, so check with the house near your study site.
Program details were checked on each program's website on October 24, 2026.
Questions about finding a Phelan-McDermid Syndrome trial near you
Are there Phelan-McDermid Syndrome clinical trials near me?
As of November 13, 2026, 3 Phelan-McDermid Syndrome clinical trials are recruiting. In the US, 3 of them have at least 1 open site, across 11 states and Washington, DC. Enter your ZIP code on this page to rank every one of them by the distance to its closest open site, with the sites shown on a map.
Which states have Phelan-McDermid Syndrome clinical trial sites?
Recruiting Phelan-McDermid Syndrome trials list open sites in Alabama, California, District of Columbia, Georgia, Illinois, Maryland, Massachusetts, Michigan, New York, Ohio, Texas and Virginia.
Are there Phelan-McDermid Syndrome trials for children near me?
All 3 Phelan-McDermid Syndrome trials with a US site accept children under 18. Their open sites are in 11 states and Washington, DC, most often Illinois, Massachusetts and New York. Each trial sets its own age limits, so check the ages listed on a trial before you contact it.
Who pays for travel to a Phelan-McDermid Syndrome clinical trial?
Many trial sponsors pay back travel, parking and hotel costs, so ask the study team before you rule out a far-away site. The FDA's guidance says paying back these costs does not count as pressuring someone to join. Charities such as Mercy Medical Angels and Air Charity Network can also help with rides and flights.
What if there is no Phelan-McDermid Syndrome trial near me?
Some trials send staff to your home or use a local lab, so fewer visits happen at the study site. You can also sign up on this page to get an email when a Phelan-McDermid Syndrome trial opens a new site or changes status.
How is the distance to a trial site measured?
Distances are straight-line miles from the center of your ZIP code to each study site's listed location, not driving distance. Your browser looks up the ZIP code's coordinates with a free map service, Zippopotam.us, and the ZIP code is never sent to or stored by Trial Friend.
Clinical trials near you for related conditions
Source: ClinicalTrials.gov, trials with status Recruiting or Not yet recruiting. Refreshed every 6 hours; counts as of November 13, 2026. Sites that ClinicalTrials.gov lists as closed or withdrawn are left out. Children means the trial's age group includes people under 18.