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Cx601

Phase 4

Crohn's Disease | Small molecule | Gastrointestinal |Takeda Pharmaceutical Company Limited|Trials Updated: Apr 23, 2025

Cx601 development status

Highest phase Phase 4 (NCT04118088)
Phase scored for TAKPhase 3
Registered trials 8 across 2 sponsors since Jun 2011

Cx601 target and mechanism

ModalitySmall molecule

Also known as Darvadstrocel, Alofisel

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials5
Total Enrollment1,042

FDA Designations

No designations recorded

Cx601 clinical trials

Cx601 · 5 trials · 4 indications

Phase 3 4Phase 1 1
NCT01541579Adipose Derived Mesenchymal Stem Cells for Induction of Remission in Perianal Fistulizing Crohn's DiseaseCrohn's Disease
COMPLETED278 Analytics
NCT03279081Study to Assess Efficacy and Safety of Cx601, Adult Allogeneic Expanded Adipose-derived Stem Cells (eASC) for the Treatment of Complex Perianal Fistula(s) in Participants With Crohn's Disease (CD)Crohn's Disease
COMPLETED568 Analytics
NCT04075825Long-term Follow-up Study With Darvadstrocel in the Treatment of Complex Perianal FistulaCrohn's Disease
COMPLETED150 Analytics
NCT03706456Phase 3 Study of Cx601 in Participants With Complex Perianal Fistulising Crohn's DiseaseComplex Perianal Fistulas in Adult Participants With Crohn's Disease
COMPLETED22 Analytics
PHASE3COMPLETED
Adipose Derived Mesenchymal Stem Cells for Induction of Remission in Perianal Fistulizing Crohn's Disease
Crohn's DiseaseUnlock trial analytics
PHASE3COMPLETED
Study to Assess Efficacy and Safety of Cx601, Adult Allogeneic Expanded Adipose-derived Stem Cells (eASC) for the Treatment of Complex Perianal Fistula(s) in Participants With Crohn's Disease (CD)
Crohn's DiseaseUnlock trial analytics
PHASE3COMPLETED
Long-term Follow-up Study With Darvadstrocel in the Treatment of Complex Perianal Fistula
Crohn's DiseaseUnlock trial analytics
PHASE3COMPLETED
Phase 3 Study of Cx601 in Participants With Complex Perianal Fistulising Crohn's Disease
Complex Perianal Fistulas in Adult Participants With Crohn's DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Combine remission of perianal fistulising Crohn's
24 weeks

Combined Remission of perianal fistulising Crohn's disease defined as the clinical assessment of closure of all treated external openings (EO) that were draining at baseline despite gentle finger compression at week 24, and absence of collections \> 2 cm of the treated perianal fistulas confirmed by centrally blinded MRI assessment by week 24.

Percentage of Participants With Combined Remission at Week 24
Week 24

Combined remission was defined as the closure of all treated external openings that were draining at baseline despite gentle finger compression and absence of collection(s) \>2 cm (in at least 2 dimensions) of the treated perianal fistula(s) confirmed by blinded central magnetic resonance imaging (MRI) assessment. Percentages are rounded off to whole number at the nearest decimal.

Number of Participants With Treatment Emergent Adverse Events (TEAEs)
Baseline (Week 0) up to Week 104 of this study (Week 52 up to Week 156 in relation to ADMIRE-CD II)

An Adverse Event (AE) is defined as any untoward medical occurrence in a clinical investigation participant administered an investigational medicinal product; it does not necessarily have to have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (example, a clinically significant abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug, whether or not it is considered related to the drug. A TEAE is defined as any event emerging or manifesting at or after the initiation of treatment with a study intervention or medicinal product or any existing event that worsens in either intensity or frequency following exposure to the study intervention or medicinal product.

Number of Participants With Treatment Emergent Serious Adverse Events (TESAEs)
Baseline (Week 0) up to Week 104 of this study (Week 52 up to Week 156 in relation to ADMIRE-CD II)

TEAE is defined as: any adverse event emerging/manifesting at or after the initiation of treatment with a study intervention/medicinal product or any existing event that worsens in either intensity/frequency following exposure to the study intervention/medicinal product. Serious adverse event (SAE) is an untoward medical occurrence, significant hazard, contraindication, side effect/precaution that at any dose: results in death, is life-threatening, required in-patient hospitalization/prolongation of existing hospitalization, results in persistent/significant disability/incapacity, is a congenital anomaly/birth defect or is medically significant.

Number of Participants With Specific Adverse Events of Special Interest (AESIs)
Baseline (Week 0) up to Week 104 of this study (Week 52 up to Week 156 in relation to ADMIRE-CD II)

AESIs are AEs that are not solicited local or systemic AEs, they are predefined AEs that require close monitoring and prompt reporting to the sponsor. Protocol pre-specified AESIs included immunogenicity/allo-immunoreactions, tumorigenicity, ectopic tissue formation and fistula/abscess. In addition, ad hoc AESIs of anaphylactic reaction, hypersensitivity, and malignancy.

Percentage of Participants With Combined Remission of Perianal Fistulising Crohn's Disease (CD) at Week 24
Week 24

Combined remission of perianal fistulising CD is defined as the clinically confirmed closure of all treated external openings that were draining at Screening despite gentle finger compression, and absence of collections \>2 cm in the treated fistulas, confirmed by central magnetic resonance imaging (MRI) assessment at Week 24 visit. In case of missing values, last observation carried forward (LOCF) method was applied. Percentages are rounded off to the nearest decimal point.

Incidence of treatment emergent adverse-events
24 weeks

Secondary Endpoints

Efficacy Assessment by week 24
24 weeks
Efficacy Assessment by week 52
52 weeks
Efficacy Assessment by week 104
104 Weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Treatment ArmEXPERIMENTALCx601 is a cell suspension in aseptic buffered solution containing human expanded adipose-derived stem cells (eASCs) of allogeneic origin in disposable vials with no preservative agents. The cells will be given at a dose of 120 million cells (5 million cells / mL) for intralesional injection.
Placebo-control groupPLACEBO_COMPARATORPlacebo (saline solution) will be given also for intralesional injection at the same quantity (volume, 24 mL) and following the same schedule.
PlaceboPLACEBO_COMPARATORPlacebo (saline) 24 milliliters (mL) was administered once by local injection.
Cx601EXPERIMENTALCx601 expanded adipose-derived stem cells (eASCs) 120 million cells (5 million cells per mL) was administered once by local injection.
DarvadstrocelEXPERIMENTALParticipants who received a single dose of darvadstrocel, 120 million cells, intralesionally previously in the ADMIRE-CD II study were observed for efficacy and safety. No drug was administered in this study.
Darvadstrocel 24 mLEXPERIMENTALDarvadstrocel (Cx601) 24 mL suspension of 120 million cells of expanded allogeneic adipose-derived stem cells (eASC) as an intralesional injection, once on Day 1.

Interventions

NameTypeDescription
Cx601OTHER120 million cells administered by intralesional injection.
Saline solutionOTHER24 mL saline solution by intralesional injection
PlaceboOTHERCx601 placebo-matching eASCs intralesional injection.
DarvadstrocelBIOLOGICALAllogenic expanded adipose-derived stem cells (eASCs) 5 million cells/ml - suspension for injection darvadstrocel received in previous ADMIRE-CD II study. No drug administration in this study.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites52

Inclusion Criteria: The reference population will consist of patients with perianal fistulising Crohn´s disease refractory to at least one of the following treatments: antibiotics, immunosuppressants or anti-tumor necrosis factor (TNF). Naïve patients are excluded, and those patients refractory to ...

Countries:AustriaBelgiumFranceGermanyIsraelItalyNetherlandsSpainUnited StatesCanadaCzechiaDenmarkHungaryPolandPuerto RicoSwedenUnited KingdomJapan
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Frequently asked questions about Cx601

What is Cx601 used for?

Cx601 is being developed for the treatment of complex perianal fistulas in patients with Crohn's disease. It is an allogeneic expanded adipose-derived stem cell therapy given to adults 18 years and older. The clinical program focuses on this specific fistulizing complication of Crohn's disease rather than Crohn's disease broadly.

Who is developing Cx601?

Cx601 is being developed by Takeda Pharmaceutical Company Limited, which trades under the ticker TAK. Takeda holds the development program for this asset in Crohn's disease associated with complex perianal fistulas.

What phase is Cx601 in?

Cx601 has completed Phase 3 clinical development. Three trials have been completed, including two Phase 3 studies and one Phase 1 study, with no trials currently active. The program has not been described as approved, so Cx601 remains an investigational therapy in clinical development.

What clinical trials is Cx601 in?

Cx601 has been studied in three completed trials. The largest, NCT03279081, was a Phase 3 study of Cx601 in adults with complex perianal fistulas and Crohn's disease that enrolled 568 participants across the United States, Canada, Europe, Israel, and Puerto Rico. NCT01541579 was a Phase 3 study in Europe with 278 participants, and NCT01372969 was an earlier Phase 1 study in Spain with 24 participants.

How was Cx601 studied in its clinical trials?

The Cx601 trials were randomized, double-blind, and placebo-controlled. The Phase 3 study NCT03279081 enrolled 568 adults with complex perianal fistulas and Crohn's disease, and the Phase 3 study NCT01541579 enrolled 278 adults. Across the three completed trials, total enrollment was 870 participants, all aged 18 years or older.