Who can join
Studies open only to men
These studies list male participants only in their official record. Most other studies accept everyone regardless of sex.
117 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingPhase 1
A Study to Learn About How Changing Therapy From Emicizumab to Marstacimab Affects People With the Severe Hemophilia A.
Pfizer
- Location
- Los Angeles, CA + 2 other US sites
- Eligibility basics
- Ages 12–74 · Men only
- RecruitingPhase 1/Phase 2
A Gene Therapy Study of SPK-8011QQ in Adults With Severe or Moderately Severe Hemophilia A
Hoffmann-La Roche
- Location
- Orange, CA + 5 other US sites
- Eligibility basics
- Ages 18+ · Men only
- RecruitingPhase 1/Phase 2
A Study to Evaluate the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Efficacy of NXT007 in Persons With Severe or Moderate Hemophilia A
Hoffmann-La Roche
- Location
- Sacramento, CA + 2 other US sites
- Eligibility basics
- Ages 2–59 · Men only
- RecruitingPhase 1/Phase 2
ATTUNE: A Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Intrathecally-Administered ION440 in Participants With Methyl CpG Binding Protein 2 (MECP2) Duplication Syndrome (MDS)
Ionis Pharmaceuticals, Inc.
- Location
- San Diego, CA + 7 other US sites
- Eligibility basics
- Ages 2–65 · Men only
- RecruitingPhase 3
Safety and Effectiveness of Giroctocogene Fitelparvovec or Fidanacogene Elaparvovec in Patients With Hemophilia A or B Respectively
Pfizer
- Location
- Rancho Cordova, CA + 12 other US sites
- Eligibility basics
- Ages 18+ · Men only
- RecruitingPhase 2
A Gene Therapy Study of RP-A501 in Male Patients With Danon Disease
Rocket Pharmaceuticals Inc.
- Location
- La Jolla, CA + 2 other US sites
- Eligibility basics
- Ages 8+ · Men only
- RecruitingPhase 4
Study to Evaluate the Safety and Effectiveness of ELEVIDYS in Participants With Duchenne Muscular Dystrophy Treated in a Post-Marketing Setting
Sarepta Therapeutics, Inc.
- Location
- Houston, TX
- Eligibility basics
- Ages 4+ · Men only
- Recruiting
Post-Market Study to Assess iTind Safety in Comparison to UroLift
Olympus Corporation of the Americas
- Location
- Phoenix, AZ + 10 other US sites
- Eligibility basics
- Ages 50+ · Men only
- RecruitingPhase 2
Study of MRM-3379 in Male Participants With Fragile X Syndrome (BLOOM)
Mirum Pharmaceuticals, Inc.
- Location
- Phoenix, AZ + 13 other US sites
- Eligibility basics
- Ages 13–45 · Men only
- RecruitingPhase 1/Phase 2
Safety, PK/PD, and Exploratory Efficacy Study of AMT-191 in Classic Fabry Disease
UniQure Biopharma B.V.
- Location
- Birmingham, AL + 9 other US sites
- Eligibility basics
- Ages 18–65 · Men only
- RecruitingPhase 4
A Study to Test a Medicine (Fitusiran) for Preventing Bleeds in People With Severe Hemophilia Who Previously Received Preventive Treatment With Emicizumab
Sanofi
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 12+ · Men only
- RecruitingPhase 1
A Gene Transfer Therapy Study to Evaluate the Safety of and Expression From Delandistrogene Moxeparvovec (SRP-9001) in Participants With Duchenne Muscular Dystrophy (DMD) - Non-Ambulatory Cohort
Sarepta Therapeutics, Inc.
- Location
- Little Rock, AR + 10 other US sites
- Eligibility basics
- Ages 2+ · Men only
- Recruiting
Evaluation of the Rigicon Infla10® Inflatable Penile Prosthesis (IPP) for Erectile Dysfunction
Rigicon, Inc.
- Location
- Coral Gables, FL + 3 other US sites
- Eligibility basics
- Ages 22+ · Men only
- Recruiting
Consumer Evaluation of an Investigational Intermittent Catheter
Hollister Incorporated
- Location
- Libertyville, IL
- Eligibility basics
- Ages 22+ · Men only
- Recruiting
Safety and Effectiveness of the Optilume® BPH Catheter System in a Post-Market Study
Urotronic Inc.
- Location
- Little Rock, AR + 6 other US sites
- Eligibility basics
- Ages 50+ · Men only
- RecruitingPhase 3
Open-Label Extension Study of Marstacimab in Hemophilia Participants With or Without Inhibitors
Pfizer
- Location
- New Hyde Park, NY + 2 other US sites
- Eligibility basics
- Ages 1–74 · Men only
- Recruiting
A Clinical Study to Evaluate the Safety and Efficacy of the FloStent in Men With Benign Prostatic Hyperplasia Symptoms
Rivermark Medical
- Location
- Bakersfield, CA + 18 other US sites
- Eligibility basics
- Ages 45+ · Men only
- RecruitingPhase 3
Efficacy, Safety, and Tolerability of Zeleciment Rostudirsen (DYNE-251) Administered Intravenously Every 4 Weeks in Ambulatory Participants With Duchenne Muscular Dystrophy (FORZETTO)
Dyne Therapeutics
- Location
- Hillsborough, NC
- Eligibility basics
- Ages 4–18 · Men only
- RecruitingPhase 4
Nuwiq for Perioperative Management Of Patients With Haemophilia A on Emicizumab Regular Prophylaxis Study
Octapharma
- Location
- Dallas, TX
- Eligibility basics
- Ages 12+ · Men only
- RecruitingPhase 2
A Clinical Trial Evaluating the Efficacy and Safety of Leflutrozole on Testicular Function
ReproNovo Aps
- Location
- North Hollywood, CA + 3 other US sites
- Eligibility basics
- Ages 18–49 · Men only
- Recruiting
Safety and Tolerability of a Novel Implantable Device for the Treatment of Erectile Dysfunction
Comphya Inc.
- Location
- Baltimore, MD
- Eligibility basics
- Ages 30–75 · Men only
- Recruiting
Evaluation of the Performance of a Novel Prostate Biopsy System Compared With Standard of Care Biopsy Needle on Quantitative and Qualitative Tissue Parameters
Uro-1 Medical
- Location
- Cartersville, GA
- Eligibility basics
- Ages 18–90 · Men only
- RecruitingPhase 1
Modulation of SERCA2a of Intra-Myocytic Calcium Trafficking in Cardiomyopathy Secondary to Duchenne Muscular Dystrophy
Sardocor Corp.
- Location
- Kansas City, KS + 2 other US sites
- Eligibility basics
- Ages 18+ · Men only
- Recruiting
Computer-Assisted Hair Restoration Study Using ARTAS System
Venus Concept
- Location
- San Jose, CA
- Eligibility basics
- Ages 20–70 · Men only
Questions
If I fit this group, will I qualify?
Not necessarily. Age and sex limits are only the first filter. Each study has its own inclusion and exclusion criteria, and the research team decides at screening.
Where do these age and sex limits come from?
From the eligibility section of each study’s official ClinicalTrials.gov record. We don’t infer eligibility from anything else.