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ATB200

Phase 3

Pompe Disease | Small molecule | Rare Disease |Amicus Therapeutics, Inc.|Trials Updated: Sep 17, 2026

ATB200 development status

Highest phase Phase 3 (NCT04138277)
Phase scored for FOLDPhase 1
Registered trials 8 across 1 sponsor since Feb 2016

ATB200 target and mechanism

ModalitySmall molecule

Also known as Cipaglucosidase alfa

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials4
Total Enrollment211

FDA Designations

No designations recorded

ATB200 clinical trials

ATB200 · 4 trials · 3 indications

Phase 3 3Phase 1 1
NCT04808505A Study to Evaluate the Safety, Efficacy, PK, PD and Immunogenicity of Cipaglucosidase Alfa/Miglustat in IOPD Subjects Aged 0 to <18Glycogen Storage Disease Type II Infantile Onset
RECRUITING36 Analytics
NCT03911505ZIP Study-OL Study of Safety, PK, Efficacy, PD, Immunogenicity of ATB200/AT2221 in Pediatrics Aged 0 to < 18 y.o. w/LOPDPompe Disease (Late-onset)
ACTIVE NOT_RECRUITING21 Analytics
NCT03729362A Study Comparing ATB200/AT2221 With Alglucosidase Alfa/Placebo in Adult Subjects With Late-onset Pompe DiseasePompe Disease (Late-onset)
COMPLETED125 Analytics
PHASE3RECRUITING
A Study to Evaluate the Safety, Efficacy, PK, PD and Immunogenicity of Cipaglucosidase Alfa/Miglustat in IOPD Subjects Aged 0 to <18
Glycogen Storage Disease Type II Infantile OnsetUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
ZIP Study-OL Study of Safety, PK, Efficacy, PD, Immunogenicity of ATB200/AT2221 in Pediatrics Aged 0 to < 18 y.o. w/LOPD
Pompe Disease (Late-onset)Unlock trial analytics
PHASE3COMPLETED
A Study Comparing ATB200/AT2221 With Alglucosidase Alfa/Placebo in Adult Subjects With Late-onset Pompe Disease
Pompe Disease (Late-onset)Unlock trial analytics

Study Endpoints

Primary Endpoints

Proportion of subjects with infusion-associated reactions (IARs)
104 weeks
Incidence of treatment-emergent adverse events (TEAEs) from baseline
52 weeks
Change From Baseline to Week 52 in 6 Minute Walk Distance (6MWD)
Baseline, Week 52

The efficacy of cipaglucosidase alfa/miglustat co-administration on ambulatory function was measured by the 6MWT. The 6MWD, measured in meters, is the distance walked on the 6MWT. A greater distance indicated greater endurance. An increase from baseline indicated improvement.

Incidence of Treatment-emergent Adverse Events (TEAEs), Treatment-emergent Serious Adverse Events (TESAEs), and Adverse Events (AEs) Leading to Discontinuation of Study Drug
Stage 3 (2 year treatment) and Stage 4 (Extension) combined, (mean = 71 months on treatment)

Number of subjects with TEAE, TESAE, and AE leading to discontinuation during the 2 year treatment period and extension (Stage 3 and 4 combined)

Plasma Human Acid α-glucosidase (GAA) Activity Levels as Measured by Maximum Observed Plasma Concentration (Cmax).
18 Weeks

Plasma GAA levels (Cmax) measured in Cohorts 1 and 3 following 1st and 3rd doses of cipaglucosidase alfa + miglustat

Plasma GAA Activity Levels as Measured by Time to Reach the Maximum Observed Plasma Concentration (Tmax).
18 Weeks

Plasma GAA levels (Tmax) measured in Cohorts 1 and 3 following 1st and 3rd doses of cipaglucosidase alfa + miglustat

Plasma GAA Activity Levels as Measured by Area Under the Plasma Drug Concentration-time Curve (AUC).
18 Weeks

Plasma GAA levels (AUC) measured in Cohorts 1 and 3 following 1st and 3rd doses of cipaglucosidase alfa + miglustat

Secondary Endpoints

Assessment of pharmacokinetic parameters
52 weeks
Change From Baseline to Week 52 in Sitting Forced Vital Capacity (FVC; % Predicted)
Baseline, Week 52
Change From Baseline to Week 52 in the Manual Muscle Test (MMT) Score for the Lower Extremities
Baseline, Week 52
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1: Cipaglucosidase Alfa/Miglustat in ERT-experienced pediatric IOPD subjectsEXPERIMENTALPediatric IOPD subjects 6 months to \<18 years experiencing clinical decline
Cohort 2: Cipaglucosidase Alfa/Miglustat in ERT-naïve pediatric IOPD subjectsEXPERIMENTALPediatric IOPD subjects \<6 months
Cipaglucosidase Alfa (ATB200)/Miglustat(AT2221)EXPERIMENTALParticipants received Cipaglucosidase Alfa (ATB200) co-administered with Miglustat (AT2221) capsule
Cipaglucosidase Alfa/MiglustatEXPERIMENTALParticipants received cipaglucosidase alfa co-administered with miglustat every 2 weeks (Q2W).
Alglucosidase Alfa/PlaceboACTIVE_COMPARATORParticipants received alglucosidase alfa co-administered with placebo Q2W.
ATB200EXPERIMENTALSequential single ascending doses of intravenously infused ATB200 for 3 dosing periods
ATB200 + AT2221EXPERIMENTALATB200 co-administered with AT2221 (Miglustat)

Interventions

NameTypeDescription
Cipaglucosidase alfaBIOLOGICALSterile lyophilized powder intravenous (IV) infusion
MiglustatDRUG65 mg oral capsules
Alglucosidase AlfaBIOLOGICALParticipants received an IV infusion dose over a 4-hour duration Q2W.
PlaceboDRUGMiglustat matching placebo was administered orally 1 hour prior to alglucosidase alfa infusion Q2W.
ATB200DRUG -
AT2221DRUG -
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Eligibility Criteria

Age RangeN/A to 17 Years
SexALL
Healthy VolunteersNo
Study Sites14

Inclusion Criteria: Cohort 1: 1. Male or female subjects who are aged 6 months to \< 18 years on Day 1 2. Subject must have documentation of IOPD genotype 3. Subject must have had hypertrophic cardiomyopathy at the time of diagnosis 4. Subject must have received ERT for at least 6 months immediate...

Countries:United StatesGermanyItalyNetherlandsTaiwanUnited KingdomAustraliaCanadaJapanArgentinaAustriaBelgiumBosnia and HerzegovinaBulgariaDenmarkFranceGreeceHungaryNew ZealandPolandSloveniaSouth KoreaSpainSweden
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Recent Changes (Last 90 Days)

MEDIUMSep 17, 2026NCT03911505primaryCompletionDate: changed
MEDIUMSep 17, 2026NCT03911505primaryCompletionDate: changed

Frequently asked questions about ATB200

What is ATB200 used for in Pompe Disease?

ATB200 is an investigational small molecule being studied for the treatment of Pompe Disease, a rare genetic disorder. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities. The drug is administered intravenously and is being evaluated for its safety, tolerability, and pharmacokinetic profile.

What does ATB200 target?

ATB200 is a small molecule designed to treat Pompe Disease, a lysosomal storage disorder. While the specific molecular target is not disclosed, the drug is being studied as a potential therapy for this condition. It is administered intravenously and is currently in Phase 1 clinical trials.

Who makes ATB200?

ATB200 is being developed by Amicus Therapeutics, Inc., a biopharmaceutical company listed on NASDAQ under the ticker symbol FOLD. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with Pompe Disease.

What phase is ATB200 in?

ATB200 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA or any other regulatory agency. The Phase 1 trial has been completed, and the drug is still in the early stages of clinical testing for Pompe Disease.

What clinical trials is ATB200 in?

ATB200 has been studied in one clinical trial, identified as NCT02675465. This was a first-in-human study to evaluate the safety, tolerability, and pharmacokinetics of intravenous ATB200 alone and when co-administered with oral AT2221. The trial enrolled 29 participants with Pompe Disease and has been completed.

Is ATB200 the same as AT2221?

No, ATB200 and AT2221 are different drugs. ATB200 is the investigational drug being studied for Pompe Disease, while AT2221 is an oral medication that was co-administered with ATB200 in the clinical trial. The study evaluated the effects of ATB200 alone and in combination with AT2221.