Long-Term Extension Study of KRN23 in Adult Subjects With X-Linked Hypophosphatemia (XLH)

Completed · Phase 2

Conditions studied: X-Linked Hypophosphatemia

In brief

The primary objectives of this study are to: * Assess the long-term safety of KRN23 subcutaneous (SC) administration in adult subjects with XLH * Assess the proportion of subjects achieving serum phosphorus levels in the normal range (2.5-4.5 mg/dL) with long-term administration of KRN23 * Assess long-term pharmacodynamics (PD) of KRN23 as measured by changes in the following: serum intact parathyroid hormone (iPTH); serum and urinary phosphorus; ratio of renal tubular maximum phosphate reabsorption rate to glomerular filtration rate (TmP/GFR) and tubular reabsorption of phosphate (TRP); serum 1,25-dihydroxy vitamin D (1,25\[OH\]2D); serum fibroblast growth factor 23 (FGF23); bone biomarkers: serum alkaline phosphatase (ALP), bone-specific ALP (BALP), carboxy terminal crosslinked telopeptide of type I collagen (CTx), and procollagen type 1 N-terminal propeptide (P1NP) * Assess long-term immunogenicity of KRN23 as measured by presence of anti-KRN23 antibody (ADA)

Key facts

Study ID

NCT02312687

Run by

Kyowa Kirin, Inc.

People needed

20

Starts

2015-01-30

Expected to finish

2018-11-30

Last updated by the study team

2024-05-06

Who can join

Age: any. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Have participated in Kyowa Hakko Kirin Pharma, Inc.'s KRN23-INT-001 (NCT01340482) or KRN23-INT-002 (NCT01571596) studies (received at least 2 doses of KRN23)
• Estimated glomerular filtration rate (eGFR) ≥ 60 mL/min or eGFR of 45 to < 60 mL/min at Screening with confirmation that the renal insufficiency was not due to nephrocalcinosis.
• Sexually active subjects must be willing to use an acceptable method of contraception (e.g., double barrier method) while participating in the study and for 30 days after receiving the last dose of KRN23.

You may not qualify if…

• Subject experienced a safety-related event in the KRN23-INT-001 or KRN23-INT-002 study that, in the opinion of the investigator and sponsor, precludes resuming KRN23 treatment.
• Presence of nephrocalcinosis on renal ultrasound that, in the opinion of the investigator and sponsor, precludes resuming KRN23 treatment.
• Pregnant or breastfeeding at Screening or planning to become pregnant (self or partner) at any time during the study.
• Participation in an investigational drug or device trial within 30 days of enrollment (other than KRN23-INT-001 or KRN23-INT-002).
• Use of a pharmacologic vitamin D metabolite or analog (e.g., calcitriol, doxercalciferol, and paricalcitol), phosphate, or aluminum hydroxide antacids (e.g., Maalox® and Mylanta®) within 21 days prior to Screening or during the study.
• Use of medication to suppress parathyroid hormone (PTH) (e.g., Sensipar®, cinacalcet, calcimimetics) within 2 months prior to Screening.

Where it is running

• University California San Francisco Hospital — San Francisco, California, United States
• Yale University School of Medicine — New Haven, Connecticut, United States
• Indiana University Hospital — Indianapolis, Indiana, United States
• Duke University — Durham, North Carolina, United States
• Houston Methodist Reasearch Institute — Houston, Texas, United States

Full record on ClinicalTrials.gov

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