24-Week Study to Assess the PD, Safety, Tolerability, and PK of GLM101 in Participants With PMM2-CDG

Glycomine

Status and phase: Enrolling; Phase 2

Conditions: Pmm2-CDG

Treatments: Drug: GLM101

Study type: Interventional

Funder types: Industry

Identifiers

NCT05549219

GLM101-002

Details and patient eligibility

About

This is a Phase 2, randomized, open-label, 24-week treatment study to evaluate the potential pharmacodynamic (PD) activity, safety, tolerability, and pharmacokinetics (PK) of GLM101 in adult, adolescent, and pediatric, patients with a confirmed diagnosis of PMM2-CDG. The planned doses of GLM101 to be investigated are 10, 20 and 30 mg/kg. The study will consist of a Screening Period, a 24-week (6-month) Treatment Period, and a 30-day (1-month) Follow-Up Period.

Enrollment: 44 estimated patients

Sex: All

Ages: 2 to 65 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Is a male or female, 18 to 65 years of age, inclusive, at Screening; 12-17 years of age inclusive at Screening or 2-11 years of age, inclusive at Screening
• Has been diagnosed with PMM2-CDG with genetic test confirmation;
• If the participant is a female of childbearing potential, she must not be pregnant (confirmed by a negative serum pregnancy test), is using a medically accepted method of contraception (abstinence, a hormonal contraceptive in conjunction with a barrier method, double-barrier method, or use of an intrauterine device), and must agree to continue using this method for 30 days after the last infusion of GLM101;
• If the participant is a female of non-childbearing potential, she must be pre-pubertal, surgically sterile, or must have an ovarian dysfunction confirmed by a follicle stimulating hormone > 40 IU/L;
• If the participant is a sexually active male with female partners, the sexually mature, nonsterile male participant agrees to use a medically acceptable method of contraception (abstinence, the partner taking a hormonal contraceptive in conjunction with a barrier method, double-barrier method, or use by the partner of an intrauterine device) and agrees to continue using this method for 30 days after the last infusion of GLM101. Males are considered surgically sterile if they have undergone bilateral orchiectomy or vasectomy at least 3 months prior to Screening;
• If the participant is male, he must agree to refrain from donating sperm during the study and 30 days after the last infusion of GLM101;
• Is willing and able to provide informed consent/assent, directly or through his/her legally authorized representative.

Exclusion criteria

• Diagnosis of congenital disorder of glycosylation (CDG) other than PMM2;
• Has an active infection requiring parenteral antibiotics, antivirals, or antifungals or treatment with systemic steroids within 7 days prior to Screening;
• Has confirmed active coronavirus disease-2019 (COVID-19) or tests positive for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) at Screening or check in to the clinical site;
• ALT or AST >3x ULN and total bilirubin >2x ULN or INR >1.5 (abnormal biological values of liver function)
• Has a history of a severe allergic reaction to any drug or excipients of GLM101 (as listed in the GLM101 Investigator's Brochure);
• Has a known history of poor venous access;
• Has a history of liver transplant;
• Has a history of drug or alcohol use disorder within 12 months from Screening;
• Has had a major surgical procedure within 30 days prior to Screening;
• Has Screening or eligibility confirmation laboratory value(s) outside the laboratory reference range considered clinically significant and not related to PMM2-CDG;
• If female, has a positive serum pregnancy test during Screening;
• Has serology positive for hepatitis B surface antigen or hepatitis C antibody during Screening;
• Has history or presence, upon clinical evaluation, of any illness that might impact the safety of GLM101 infusion or evaluability of drug effect based on the Investigator's and Medical Monitor's discretion;
• Is currently participating in another interventional clinical study or has completed another clinical study with an investigational drug or device within 30 days or 5 half-lives before GLM101 infusion, except for acetazolamide. Participants may be enrolled and continue treatment with acetazolamide only if they are on a stable dose for at least 30 days prior to dosing with GLM101, and the dose remains unchanged for the duration of the study.
• Weight exceeds 75 kg

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Sequential Assignment

Masking: None (Open label)

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44 participants in 3 patient groups

10 mg/kg GLM101

Experimental group

Description:

GLM101 IV infusions, given weekly

Treatment:

Drug: GLM101

20 mg/kg GLM101

Experimental group

Description:

GLM101 IV infusions, given weekly

Treatment:

Drug: GLM101

30 mg/kg GLM101

Experimental group

Description:

GLM101 IV infusions, given weekly

Treatment:

Drug: GLM101