A Phase 2 interventional study of KRN23 in Tumor-Induced Osteomalacia or Epidermal Nevus Syndrome, sponsored by Kyowa Kirin Co., Ltd.. Completed at 3 sites in 2 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2022-09-06.
Sponsored by Kyowa Kirin Co., Ltd. · Phase 2, Interventional, and Treatment
Before switching to the post-marketing study:
To evaluate the efficacy and safety of KRN23 after its 144-week once every 4 weeks (Q4W) repeated SC administration to Japanese and Korean patients with TIO or ENS by a multicenter, open-label, intraindividual dose adjustment study.
After switching to the post-marketing study:
To evaluate the safety and efficacy of KRN23, which is switched from the investigational product to the post-marketing investigational product, at the approved dose and dosing regimen in subjects who continue treatment after the marketing approval of KRN23 in Japan.
Kyowa Kirin Co., Ltd. is the lead sponsor of 159 studies on the registry; 8 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
At the time of switching to the post-marketing study:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Subjects will receive subcutaneous injections of KRN23 every 4 weeks from Week 0 through Week 224
Drug: KRN23
Doses may be titrated to achieve the target peak serum phosphorus range
serum phosphorus concentration at each test time point
Time frame: up to week 224
Change from Baseline in Serum Phosphorus Level
Time frame: up to week 224
Achievement Proportion of Mid-Cycle-Mean Serum Phosphorus Value (mg/dL) Exceeding the Lower Limit (2.5 mg/dL [0.81 mmol/L])
Time frame: at week 24
Achievement Proportion of End-Cycle-Mean Serum Phosphorus Value (mg/dL) Exceeding the Lower Limit (2.5 mg/dL [0.81 mmol/L])
Time frame: at week 48
Changes from baseline over time in serum Type I Collagen C-Telopeptides (CTx)
Time frame: up to week 224
Changes from baseline over time in serum Procollagen 1 N-Terminal Propeptide (P1NP)
Time frame: up to week 224
Changes from baseline over time in serum Bone Specific Alkaline Phosphatase (BALP)
Time frame: up to week 224
Changes from baseline over time in serum Osteocalcin (OC)
Time frame: up to week 224
change from baseline in FGF23
Time frame: up to week 224
change from baseline in alkaline phosphatase
Time frame: up to week 224
change from baseline in 1,25(OH)2D
Time frame: up to week 224
change from baseline in urine P
Time frame: up to week 224
change from baseline in tubular reabsorption of phosphate
Time frame: up to week 224
change from baseline in ratio of renal tubular maximum phosphate reabsorption rate to glomerular filtration rate
Time frame: up to week 224
change from baseline in skeletal disease/osteomalacia through trans-iliac crest bone biopsy
Time frame: up to week 224
Effect to Sit to Stand (STS) test
Time frame: up to week 224
Effect to Hand Held Dynamometry (HHD)
Time frame: up to week 224
Effect to Weighted Arm Lift (WAL) test
Time frame: up to week 224
Effect to 6 minute walking test (6MWT)
Time frame: up to week 224
Effect to patient reported outcomes
Time frame: up to week 224
maximum concentration (Cmax) of KRN23
Time frame: up to week 224
area under the curve (AUC) of KRN23
Time frame: up to week 224
time to peak (tmax) of KRN23
Time frame: up to week 224
Number and types of adverse events
Time frame: up to week 224
This study is completed, as verified in Aug 2022. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Studies of the drug tested here: Burosumab
Oncogenic osteomalacia