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Trial registered on ANZCTR
Registration number
ACTRN12613000594729
Ethics application status
Approved
Date submitted
23/05/2013
Date registered
27/05/2013
Date last updated
3/01/2014
Type of registration
Prospectively registered
Titles & IDs
Public title
Study to determine levels of Fibroblast Growth Factor 23 and other associated markers of bone turnover in men with various iron store states of iron overload, iron deficiency and normal iron stores.
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Scientific title
Study comparing differences in fibroblast growth factor 23 and other markers of bone turnover in men with various iron store states of iron overload, iron deficiency and normal iron stores.
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Secondary ID [1]
282532
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Nil known
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Universal Trial Number (UTN)
Nil
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Trial acronym
Nil
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
iron deficiency
289197
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iron overload
289241
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normal iron stores
289242
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bone metabolism
289243
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Condition category
Condition code
Metabolic and Endocrine
289526
289526
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0
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Other metabolic disorders
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Diet and Nutrition
289572
289572
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0
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Other diet and nutrition disorders
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Intervention/exposure
Study type
Observational
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Patient registry
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Target follow-up duration
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Target follow-up type
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Description of intervention(s) / exposure
Not applicable- observational study
Levels of FGF23, associated blood and urine markers of bone metabolism and bone mass are being studied. The duration of observation in each participant is at a single time point.
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Intervention code [1]
287195
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Not applicable
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Comparator / control treatment
not applicable
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Control group
Uncontrolled
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Outcomes
Primary outcome [1]
289624
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Comparative mean or median (depending on the distribution of the data) intact fibroblast growth factor 23 and C Terminal fibroblast growth factor 23 levels in the 3 groups of men with iron deficiency, normal iron stores and iron overload. Previous studies have compared either geometric mean FGF23 levels or log transformed median FGF23 levels. FGF23 levels ( intact and C-terminal) will be assessed by serum assay. Iron studies will be assessed by serum assay.
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Assessment method [1]
289624
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Timepoint [1]
289624
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At the completion of analysis of results, once all the data have been collected, which is predicted to be approximately 10-12 months after the start of recruitment. This outcome will be assessed in each participant on one occasion only.
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Secondary outcome [1]
302888
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Comparative means or medians, depending on the distribution of the data, for associated markers of bone turnover and bone mass in the 3 groups of men with differing levels of iron stores - iron overload, iron deficiency or normal iron stores. The following bone markers will be assessed by serum or plasma assay: 25OH vitamin D, 1, 25 diOH vitamin D, PTH, P1NP, CTX, LH, SHBG, testosterone, EUC, CMP, CRP, LFTs, FE Studies, FGF23 intact, FGF23 C terminal. Full blood count will be assessed from this single blood sample. Tubular resorption of phosphate will be assessed on a single fasting urine sample. bone density will be assessed by DEXA.
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Assessment method [1]
302888
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Timepoint [1]
302888
0
Again, as for the primary outcome, this will occur once all the data have been collected and analysed, which is expected to be within 12 months from the start of recruitment. These outcomes will be assessed in each participant on one occasion only.
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Secondary outcome [2]
303817
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Comparative means or medians of body composition markers of lean and fat mass by DEXA (dual X-ray absorptiometry) for the 3 participant groups, depending on the distribution of the data.
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Assessment method [2]
303817
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Timepoint [2]
303817
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To be performed around the time that blood and urine samples are taken
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Eligibility
Key inclusion criteria
The study population will comprise males of age 35 years or greater who meet one of the following criteria:
1. iron overload due to haemochromatosis with ferritin > 300microg/l, the upper limit of the reference range or
2. normal iron studies
3. iron deficiency with ferritin < 30 microg/l ie. below the lower limit of the reference range
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Minimum age
35
Years
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Maximum age
No limit
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Sex
Males
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Can healthy volunteers participate?
Yes
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Key exclusion criteria
1. Intercurrent proven evidence of cancer – as this will affect ferritin levels and interpretation and may alter FGF 23
2. Active infection- will affect ferritin levels and interpretation and may alter FGF 23
3. Chronic kidney disease with eGFR< 50 - as eGFR drops, FGF23 levels rise rapidly
4. Current glucocorticoid use,
5. Hypercalcaemia
6. Vitamin D deficiency with 25OH vitamin D level < 25 nmol/l
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Study design
Purpose
Natural history
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Duration
Cross-sectional
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Selection
Case control
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Timing
Prospective
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Statistical methods / analysis
For data that are normally distributed, analysis of variance (ANOVA) testing will be used to determine if differences between the 3 groups are statistically significant. If data are not normally distributed then the Kruskal-Wallis test for non-parametric analysis will be used to compare values and assess for differences between the 3 groups.
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Recruitment
Recruitment status
Recruiting
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Date of first participant enrolment
Anticipated
23/07/2013
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Actual
8/08/2013
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Date of last participant enrolment
Anticipated
30/04/2014
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Actual
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Date of last data collection
Anticipated
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Actual
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Sample size
Target
140
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Accrual to date
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Final
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Recruitment in Australia
Recruitment state(s)
NSW
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Recruitment hospital [1]
1041
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Nepean Hospital - Kingswood
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Recruitment hospital [2]
1042
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Blue Mountains District ANZAC Memorial Hospital - Katoomba
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Recruitment postcode(s) [1]
6904
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2747 - Kingswood
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Recruitment postcode(s) [2]
6905
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2780 - Katoomba
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Funding & Sponsors
Funding source category [1]
287322
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Charities/Societies/Foundations
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Name [1]
287322
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Nepean Medical Research Foundation
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Address [1]
287322
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PO Box 1838
Penrith
NSW 2751.
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Country [1]
287322
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Australia
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Primary sponsor type
Individual
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Name
Associate Professor Emily Hibbert
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Address
Dept of Academic Medicine
Nepean Clinical School Building
Nepean Hospital
PO Box 63
Penrith,
NSW 2751.
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Country
Australia
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Secondary sponsor category [1]
286087
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None
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Name [1]
286087
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Address [1]
286087
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Country [1]
286087
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
289315
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Nepean Blue Mountains Local Health District Human Research Ethics Committee
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Ethics committee address [1]
289315
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Court Building, Ground Floor
Nepean Hospital
PO Box 63
Penrith
NSW 2751.
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Ethics committee country [1]
289315
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Australia
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Date submitted for ethics approval [1]
289315
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16/11/2012
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Approval date [1]
289315
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20/02/2013
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Ethics approval number [1]
289315
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Study 12/66 - HREC/12/NEPEAN/149
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Summary
Brief summary
This study is a cross sectional case control study which will determine levels of FGF23, a phosphate regulatory protein produced by osteocytes in men with iron overload, using haemochromatosis as a model of iron overload, in men with iron deficiency and in men with normal iron stores. Associated markers of bone metabolism will be measured in blood and urine and bone densitometry and body composition studies will be performed by Dual X-ray absorptiometry.
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Trial website
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Trial related presentations / publications
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Public notes
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Contacts
Principal investigator
Name
40194
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A/Prof Emily Hibbert
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Address
40194
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Dept of Academic Medicine
Nepean Clinical School Building
Nepean Hospital
PO Box 63
Penrith,
NSW 2751.
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Country
40194
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Australia
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Phone
40194
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+61 419 606 608
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Fax
40194
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+612 4734 1817
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Email
40194
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[email protected]
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Contact person for public queries
Name
40195
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A/Prof Emily Hibbert
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Address
40195
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Dept of Academic Medicine
Nepean Clinical School Building
Nepean Hospital
PO Box 63
Penrith,
NSW 2751.
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Country
40195
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Australia
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Phone
40195
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+612 4734 3294
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Fax
40195
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+612 4734 1817
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Email
40195
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[email protected]
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Contact person for scientific queries
Name
40196
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A/Prof Emily Hibbert
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Address
40196
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Dept of Academic Medicine
Nepean Clinical School Building
Nepean Hospital
PO Box 63
Penrith,
NSW 2751
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Country
40196
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Australia
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Phone
40196
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+612 4734 3294
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Fax
40196
0
+612 4734 1817
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Email
40196
0
[email protected]
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No information has been provided regarding IPD availability
What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
Documents added manually
No documents have been uploaded by study researchers.
Documents added automatically
No additional documents have been identified.
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