| Eligibility |
Inclusion Criteria:
- Written, signed informed consent of the parent(s) or legal guardian(s) of the
participant, and as required by the institutional review board/human research ethics
committee/independent ethics committee (IRB/HREC/IEC).
- Male or female, between 2 and 11 years of age (inclusive) at the time of Screening.
- Clinical diagnosis of ACH with documented genetic confirmation available.
- Able to stand without assistance.
- Parent(s)/legal guardian(s) willing and able to administer weekly SC injections of IMP
and to follow the protocol.
- At least six months of growth and disease history from ACHieve (TCC-NHS-01) trial or
comparable growth and disease history available from medical records (pending
confirmation by Medical Monitor).
- Considered eligible based on the medical history, physical examination, and the
results of vital signs, ECG and clinical laboratory tests performed during the
Screening period
Exclusion Criteria:
- Participation (i.e., signed informed consent) in any interventional clinical trial
before within 3 months prior to screening.
- Closed epiphysis.
- Known or suspected hypersensitivity to the IMP or related products (trehalose,
tris[hydroxymethyl]aminomethane, succinate, and mPEG).
- Have a growth disorder or medical condition other than ACH that results in short
stature or abnormal growth such as severe ACH with developmental delay and acanthosis
nigricans (SADDAN), hypochondroplasia, growth hormone deficiency, Turner syndrome,
pseudoachondroplasia, inflammatory bowel disease, celiac disease, hypothyroidism,
hyperthyroidism, pre-diabetes, or diabetes mellitus.
- Have received any dose of prescription medications and IMP or surgical intervention
intended to affect stature, growth, or body proportionality at any time.
- Requires, or anticipated to require, chronic (> 4 weeks) or repeated treatment (more
than twice/year and >3 weeks/year) with systemic corticosteroids during participation
in the trial. Chronic use of high-dose inhaled corticosteroids is not allowed.
- Known history of presence of injury or disease of the growth plate(s), other than ACH,
that affects growth potential of long bones.
- Known history of any bone-related surgery affecting growth potential of long bones,
such as:
- Orthopedic reconstructive surgery for bone lengthening (e.g., procedures for leg
bowing such as 8-plate are not exclusionary).
- Cervicomedullary decompression surgery without anticipated need for repeat
decompression during the time of the trial are allowed with minimum of 6 months
of bone healing.
- Ventriculoperitoneal (VP) shunt and laminectomy with full recovery are allowed
with minimum of 6 months of bone healing.
- Bone fracture within 6 months prior to screening (within 2 months for fracture of
digits and buckle fractures).
- Clinically significant findings at Screening, such as:
- Expected to require surgical intervention during participation in the trial.
Common surgeries, such as insertion of grommets, adenoidectomy, tonsillectomy, or
myringotomy tube placement, are permitted.
- Severe untreated sleep apnea or newly initiated sleep apnea treatment (e.g.,
Continuous Positive Airway Pressure [CPAP] in the previous 2 months prior to
Screening).
- Musculoskeletal disease, such as Salter-Harris fractures or clinical and/or
radiographic evidence of severe hip pathology, or
- Otherwise, are considered by the Investigator and Medical Monitor to make a
participant unfit to receive trial treatment or undergo trial related procedures.
- Have evidence at Screening that are consistent with severe cervicomedullary junction
compression based on clinical and/or radiologic findings that indicate immediate
surgical intervention is required.
- Have a clinically significant finding or arrhythmia as determined by the investigator
in consultation with the medical monitor that indicates abnormal cardiac function or
conduction that includes, but is not exclusive to:
- Repaired or unrepaired coarctation.
- Moderate or greater complexity congenital heart disease including tetralogy of
Fallot, Atrioventricular septal defects, truncus arteriosus, total anomalous
pulmonary venous return, double outlet right ventricle, or single ventricle heart
disease.
- QTcF = 450 msec at the Screening Visit.
- Known history or presence of condition that impacts hemodynamic stability (such as
autonomic dysfunction and orthostatic intolerance).
- Known history or presence of the following:
- Chronic anemia (iron deficiency anemia that is resolved or adequately treated in
the Investigator's opinion is allowed).
- Chronic renal insufficiency (GFR <60 mL/min/1.73 m2 for >3 months).
- Chronic or recurrent illness that can affect hydration or volume status,
including conditions associated with decreased nutritional intake or increased
volume loss.
- Known history or presence of malignant disease.
- Participant with serum 25-hydroxy-vitamin D (25OHD) levels of <30 nmol/L (<12 ng/mL)
at Screening Visit will be excluded. Participants with 25OHD levels between 30-50
nmol/L (12-20 ng/mL) can be randomized provided treatment with Vitamin D
supplementation is initiated.
- Any disease or condition that, in the opinion of the Investigator, may make the
participant unlikely to fully complete the trial, may confound interpretation of trial
results, or may present undue risk from receiving trial treatment. This could include
family situations, complications or manifestations, or medications that might impact
safety or be considered confounding.
- Sexually active male and female participants and female partners of male participants
of childbearing potential not using a highly effective form of contraceptive for the
entire trial period and for 90 days after last dose of trial treatment.
|
