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FX201

Phase 1

Osteoarthritis, Knee | Gene therapy | Musculoskeletal |Pacira BioSciences, Inc.|Trials Updated: Sep 17, 2026

FX201 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Oct 2019

FX201 target and mechanism

Molecular targetIL1RA
ModalityGene therapy

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment72

FDA Designations

No designations recorded

FX201 clinical trials

FX201 · 1 trial · 1 indication

Phase 1 1
NCT04119687Study to Evaluate the Safety and Tolerability of FX201 in Patients With Osteoarthritis of the KneeOsteoarthritis, Knee
ACTIVE NOT_RECRUITING72 Analytics
PHASE1ACTIVE NOT_RECRUITING
Study to Evaluate the Safety and Tolerability of FX201 in Patients With Osteoarthritis of the Knee
Osteoarthritis, KneeUnlock trial analytics

Study Endpoints

Primary Endpoints

Primary Outcome Measure: Incidence of treatment emergent adverse events after a single intra-articular (IA) injection of FX201 (safety and tolerability)
Baseline to Week 104

Incidence of treatment emergent adverse events after a single intra-articular (IA) injection of FX201

Secondary Endpoints

Secondary Outcome Measure: Characterization of the systemic biodistribution of FX201 as seen through the percentage of patients positive for FX201 at Baseline, Day 1, Day 2, Week 1, Week 2, Week 3, and Week 4
Baseline, Day 1, Day 2, Week 1, Week 2, Week 3, Week 4
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Low Dose FX201EXPERIMENTALSingle low dose FX201 injection
Mid Dose FX201EXPERIMENTALSingle mid dose FX201 injection
High Dose FX201EXPERIMENTALSingle high dose FX201 injection

Interventions

NameTypeDescription
FX201BIOLOGICALFX201, humantakinogene hadenovec, is a novel interleukin-1 receptor antagonist (IL-1Ra) gene therapy for IA administration that is being developed for the treatment of patients with OAK.
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Eligibility Criteria

Age Range30 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites6

Inclusion Criteria: * Written consent to participate in the study * Male or female 30 to 80 years of age, inclusive, on the day of enrollment (Day 1) * Body mass index (BMI) ≤ 40 kilograms per meters squared (kg/m2) * Clinical diagnosis of OA of the knee on the American College of Rheumatology crit...

Countries:United States
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Competitive Landscape -Osteoarthritis 143 trials (matched to "Osteoarthritis, Knee")

Recent Changes (Last 90 Days)

LOWSep 17, 2026NCT04119687lastUpdatePostDate: changed
LOWSep 17, 2026NCT04119687lastUpdatePostDate: changed

Frequently asked questions about FX201

What is FX201 used for?

FX201 is an investigational gene therapy being developed for the treatment of osteoarthritis of the knee. It is designed to be given as a single intra-articular injection into the knee joint, where it aims to provide sustained production of an anti-inflammatory protein to reduce pain and inflammation associated with knee osteoarthritis.

What does FX201 target?

FX201 targets the interleukin-1 receptor antagonist, or IL1RA. By delivering genetic material that codes for IL1RA, FX201 is intended to increase local production of this natural anti-inflammatory protein within the knee joint, thereby blocking interleukin-1 signaling and reducing inflammation and cartilage degradation in osteoarthritis.

Who is developing FX201?

FX201 is being developed by Pacira BioSciences, Inc., which trades on the Nasdaq under the ticker symbol PCRX. Pacira is a specialty pharmaceutical company focused on non-opioid pain management and regenerative health products.

What phase is FX201 in?

FX201 is in Phase 1 clinical development. It is an investigational therapy and has not been approved by the FDA for any indication. The Phase 1 program is evaluating its safety and tolerability in patients with osteoarthritis of the knee.

What clinical trials is FX201 in?

FX201 is being studied in a single Phase 1 clinical trial, NCT04119687, titled "Study to Evaluate the Safety and Tolerability of FX201 in Patients With Osteoarthritis of the Knee." The trial has an estimated enrollment of 72 participants, is controlled, and is currently active but not recruiting. It is being conducted in the United States.

Is FX201 the same as IL1RA gene therapy?

FX201 is a gene therapy that targets IL1RA, but it is a specific investigational product developed by Pacira BioSciences. It is not simply interchangeable with other IL1RA-targeting therapies; FX201 refers to this particular agent and its clinical program.