Muscle Function Improved in 9 out of 10 Patients
Pulmonary Function Improved in a Majority of Patients
No Infusion-Associated Reactions Following 200+ Infusions
Conference Call at 8:30am ET
CRANBURY, N.J., (May 15, 2017) (GLOBE NEWSWIRE) – Amicus Therapeutics (Nasdaq:FOLD) today announced positive functional data from initial patients in a global Phase 1/2 study (ATB200-02) to investigate ATB200/AT2221 in patients with Pompe disease. Patients who completed six months of treatment with ATB200/AT2221 showed improvements in the six-minute walk test (6MWT) distance and other measures of motor function, in addition to stability or improvements in forced vital capacity (FVC). Consistent with previous results1 presented at the 2017 WORLDSymposium™, patients treated with ATB200/AT2221 continue to show improvements in biomarkers of muscle damage and disease substrate.
“We are very pleased to see improvements in six minute walk distance and other measures of motor function in both naïve and ERT-switch patients, as well as stability or improvements in forced vital capacity. The consistency and magnitude of improvements exceeded our expectations and follow the initial improvements seen on key biomarkers of muscle damage and disease substrate,” said
and Chief Executive Officer of
ATB200-02 Study – Updated Data Highlights in Initial ERT-Switch and Naive Patients
Safety, Tolerability & Pharmacokinetics (PK)
Safety and tolerability data are currently available for all 20 patients enrolled in the study (maximum 48 weeks). To date, adverse events have been generally mild and transient. Importantly, ATB200/AT2221 has also shown no infusion-associated reactions following 200+ infusions. As previously reported, the clinical PK profile has been consistent with previously reported preclinical data.
Pharmacodynamic (PD) Data on Muscle Damage and Disease Substrate Biomarkers (n=16)
PD data are currently available for 11 ERT-switch patients and five ERT-naïve patients. Improvements in key biomarkers of muscle damage and disease substrate continue to suggest a positive effect of ATB200/AT2221
on muscle cells after up to 34 weeks of treatment.
- Muscle damage biomarkers: Creatine kinase (CK) enzyme, alanine aminotransferase (ALT), and aspartate aminotransferase (AST) continue to show a decrease in a majority of patients. Across the three biomarkers, mean reductions from baseline were approximately 15-20% and 50-55% for the ERT-switch and ERT-naïve patients, respectively.
- Disease substrate biomarker: Urine hexose tetrasaccharide (Hex4) continues to show decreases in a majority of ERT-switch patients and all ERT-naïve patients, with mean reductions from baseline of approximately 40% and 50% for the ERT-switch and ERT-naïve patients, respectively.
Functional Outcomes at Month 6 (n=10)
Functional outcomes data from baseline to Month 6 are
currently available for 10 patients (seven ambulatory ERT-switch, two ERT-naïve and one non-ambulatory ERT-switch). Motor function improved and pulmonary function was stable in ambulatory ERT-switch patients; motor and pulmonary function both improved in ERT-naïve patients. Muscle strength data are available from the first non-ambulatory ERT-switch patient and showed improvement.
- Muscle Function:
– Motor function: Six-minute walk test (6MWT) distance, a primary measure of motor function in Pompe patients, increased in both ERT-switch patients (mean +38 meters; improvement in 6/7 patients) and ERT-naïve patients (mean +52 meters; improvement in 2/2 patients). Other motor function tests also showed mean improvements, consistent with 6MWT distance.
– Muscle Strength: In the
first non-ambulatory ERT-switch patient, improvements in four out of four muscle groups on the quantitative muscle testing (QMT) and two of three muscle groups on the manual muscle testing (MMT) were observed.
- Pulmonary Function: Forced vital capacity (FVC), the primary measure of pulmonary function, was stable in ERT-switch patients (mean absolute change in percent predicted FVC +0.3%) and improved in ERT-naïve patients (mean absolute change +3.0%). Other pulmonary tests included maximal inspiratory pressure (MIP), a measure of inhalation, and maximal expiratory pressure (MEP), a measure of exhalation. MIP and MEP both showed mean increases in ERT-switch patients. MIP showed a mean increase and MEP showed a mean decrease in ERT-naïve patients.
Summary of Functional Outcomes from Baseline to Month 6
Cohort 1 ERT-Switch Patients (n=7): Functional Outcomes on ATB200/AT2221 from Baseline to Month 6
|Motor Function Tests (n=7)||Pulmonary Function Tests (n=6-7)|
|6MWT (m)||4 Stair
and go (sec)
|383 (103)||4.4 (3.1)||11.0 (7.7)||7.5 (3.5)||51 (17)||35.4 (11.3)||69.5 (21.2)|
|+38 (43)||-1.1 (1.3)||-1.9 (2.8)||-0.04 (1.6)||+0.3 (3)||+1.0 (5.2)||+15.5 (25.4)|
Cohort 3 ERT-Naïve Patients (n=2): Functional Outcomes on ATB200/AT2221 from Baseline to Month 6
|Motor Function Tests (n=2)||Pulmonary Function Tests (n=2)|
|6MWT (m)||4 Stair
and go (sec)
|432 (68)||3.9 (0.6)||8.9 (0.9)||6.9 (0.8)||51 (27)||45.5 (27.6)||57.5 (9.2)|
|+52 (15)||-0.3 (0.0)||-1.4 (0.4)||-0.5 (0.2)||+3 (0)||+8.5 (3.5)||-4.5 (17.7)|
Conference Call and Webcast
Amicus Therapeutics will host a conference call and webcast today,
An audio webcast can also be accessed via the Investors section of the
corporate web site at http://ir.amicusrx.com/events.cfm, and will be archived for 30 days. Web participants are encouraged to go to the web site 15 minutes prior to the start of the call to register, download and install any necessary software. A telephonic replay of the call will be available for seven days beginning at
About ATB200-02 Clinical Study
The primary objectives of the open-label ATB200-02 clinical study are to evaluate the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of ATB200/AT2221 over an 18-week primary treatment period followed by a long-term extension. The study enrolled a total of 20 patients across three patient cohorts: ambulatory ERT-switch (Cohort 1, n=11), non-ambulatory ERT-switch (Cohort 2, n=4) and ERT-naïve (Cohort 3, n=5). Patients in Cohort 1 received escalating doses of ATB200 (5, 10, 20 mg/kg), followed by 3 doses of 20 mg/kg ATB200 plus low dose AT2221, followed by ongoing doses of 20 mg/kg ATB200 plus high dose AT2221. Patients in Cohort 2 and 3 patients have all received 20 mg/kg ATB200 plus high dose AT2221.
ATB200/AT2221 is a novel treatment paradigm that consists of ATB200, a unique recombinant human acid alpha-glucosidase (rhGAA) enzyme with optimized carbohydrate structures, particularly mannose-6 phosphate (M6P), to enhance uptake, co-administered with AT2221, a pharmacological chaperone. In preclinical studies, ATB200 was associated with increased tissue enzyme levels and reduced glycogen levels in muscle, which was further improved when AT2221 was co-administered with ATB200.
About Pompe Disease
Pompe disease is an inherited lysosomal storage disorder caused by deficiency of an enzyme called acid alpha-glucosidase (GAA). Reduced or absent levels of GAA lead to the accumulation of the
substrate glycogen in the lysosomes of muscles and other tissues. Progressive accumulation of glycogen is believed to lead to the morbidity and mortality associated with Pompe disease, including muscle weakness and respiratory insufficiency.
for a broad range of human genetic diseases. Amicus’ lead programs in development include the small molecule pharmacological chaperone migalastat as a monotherapy for Fabry disease, SD-101 for Epidermolysis Bullosa (EB), as well as novel enzyme replacement therapy (ERT) and biologic products for Fabry disease, Pompe disease, and other rare and devastating diseases.
1Johnson, et. al, WORLDSymposium 2017, First-in-human preliminary pharmacokinetic and safety data on a novel recombinant acid-α-glucosidase, ATB200, co-administered with the pharmacological chaperone, AT2221, in ERT-experienced Pompe patients
This press release contains “forward- looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, including statements relating to encouraging preliminary data from a global Phase 1/2 study to investigate ATB200/AT2221 for the treatment of Pompe and the potential implications on these data for the future advancement and development of ATB200/AT2221. Words such as, but not limited to, “look forward to,” “believe,” “expect,” “anticipate,” “estimate,” “intend,” “confidence,” “encouraged,” “potential,” “plan,” “targets,” “likely,” “may,” “will,” “would,” “should” and “could,” and similar expressions or words identify forward-looking statements. The forward looking statements included in this press release are based on management’s current expectations and belief’s which are subject to a number of risks, uncertainties and factors, including that the preliminary data based on a small patient sample and reported before completion of the study will not be predictive of future results, that results of additional preliminary data or data from the completed study or any future study will not yield results that are consistent with the preliminary data presented, that the Company will be not able to demonstrate the safety and efficacy of ATB200/AT2221, that later study results will not support further development, or even if such later results are favorable, that the Company will not be able to successfully complete the development of, obtain regulatory approval for, or successfully commercialize ATB200/AT2221. In addition, all forward looking statements are subject to the other risks and uncertainties detailed in our Annual Report on Form 10-K for the year ended
Senior Director, Investor Relations
Source: Amicus Therapeutics, Inc for more details