Table of contents
- Trial overview
- Who is being studied
- What the trials measure
- Trial phases and status
- Trial designs and treatment plans
- Key patient terms
Trial overview
Two interventional studies are investigating ALFA-D-MANNOSE 1-PHOSPHATE DIPOTASSIUM through the study drug GLM101 in people with PMM2-CDG.[1][2] Both studies are Phase 2 and are listed as authorised.[1][2]
One study is focused on weekly doses and compares GLM101 with placebo to see whether symptoms of ataxia change after 24 weeks.[1] The other is a long-term study that follows patients who previously received GLM101 to learn more about safety over time.[2]
Who is being studied
The target condition in both trials is PMM2-CDG, which is the only condition named in the source data.[1][2] The long-term study includes patients who already received GLM101 before joining this follow-up study.[2]
The first trial plans to enroll 50 participants, and the long-term study plans to enroll 80 participants.[1][2] This means the research is being done in relatively small groups, which is common in early testing stages.[1][2]
What the trials measure
The main outcome in the weekly-dose study is the change from baseline in ICARS at 24 weeks.[1] Baseline means the starting point before treatment begins, and ICARS is a score used to measure ataxia, which means problems with balance and coordination.[1]
The long-term study mainly collects safety information.[2] This includes side effects, deaths, stopping the study because of side effects, blood and urine tests, ECG results, vital signs, and changes in the physical exam compared with before treatment.[2]
Trial phases and status
Both trials are in Phase 2, which usually means the treatment is being studied in a smaller group of patients to learn more about safety and possible benefit.[1][2] Both studies are marked as authorised in the source data.[1][2]
The first trial is designed to compare GLM101 with placebo, while the second trial follows patients over a longer period with GLM101 exposure already in their history.[1][2] These two designs help researchers look at both short-term effect and longer-term safety.[1][2]
Trial designs and treatment plans
In the first study, participants receive weekly doses of GLM101 or placebo by intravenous administration, which means the treatment is given into a vein.[1] The source data lists the dose as 30 mg/kg for both GLM101 and the placebo infusion description.[1]
In the long-term study, GLM101 is also given by intravenous use.[2] The study is not focused on a new comparison with placebo; instead, it is built to watch what happens over time in patients who have already received the treatment.[2]
Key patient terms
Ataxia means trouble with balance and coordination, which can affect walking and movement.[1]
Placebo means a look-alike treatment used for comparison in a study, so researchers can see whether the study drug has a real effect.[1]
Vital signs are basic health checks such as blood pressure, heart rate, and body temperature.[2]
ECG is a heart tracing test that shows the heart’s electrical activity.[2]
Urinalysis and blood tests help researchers watch for changes in body function during the study.[2]



