Vitamin K as Additive Treatment in Osteoporosis (VITKANDOP)
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|ClinicalTrials.gov Identifier: NCT01232647|
Recruitment Status : Active, not recruiting
First Posted : November 2, 2010
Last Update Posted : February 13, 2020
|Condition or disease||Intervention/treatment||Phase|
|Post-menopausal Osteoporosis||Drug: Phylloquinone Drug: Menatetrenone (MK4) Drug: placebo||Phase 2 Phase 3|
Vitamin K is important for skeletal health. Vitamin K is essential for the carboxylation of several Gla proteins in bone which are implicated in bone formation and mineralization. These include osteocalcin (OC) and matrix Gla protein (MGP). Carboxylation of the glutamic acid residues of these proteins optimises their function. Vitamin K occurs as either phylloquinone (vitamin K1) which is the major dietary form or menaquinones (MKs or vitamin K2) which are mainly of bacterial origin. MK4 of the vitamin K2 series has additional, carboxylation-independent, functions including the regulation of osteoblastic specific markers such as alkaline phosphatase (BALP), and osteoprotegerin (OPG) and has inhibitory effects on osteoclast activity. Several observational studies have shown that low vitamin K status is associated with low bone mineral density (BMD) and increased fracture risk, although proof of causality is lacking. The results of several placebo-controlled clinical trials of vitamin K1 and MK4 have been conflicting with some, but not all, showing a positive effect of vitamin K1 on BMD or bone turnover. Positive fracture efficacy has been demonstrated with high-dose MK4, although most trials were on Japanese women. These intervention studies may have been hampered by the study design such as inclusion of vitamin K replete subjects or healthy non-osteoporotic women. The use of vitamin K in the prevention of bone loss and/or fractures in high-risk post-menopausal women with osteoporosis who are vitamin K deplete merits further investigations. The prevalence of low vitamin K stores is high in elderly subjects with osteoporosis. Preliminary data in Japanese women suggest that combined treatment with a bisphosphonate and vitamin K, at least vitamin K2 (MK4), appears to have an additive beneficial effect on BMD and bone resorption. There have been no such studies in a caucasian osteoporotic population. We want to test the hypothesis that treatment with bisphosphonates combined with vitamin K, in vitamin K deplete elderly women with osteoporosis, may offer additional benefit on skeletal metabolism and reduction of fracture risk.
The first part will be a cross-sectional study of post-menopausal women with osteoporosis aged between 60-80 years who are on treatment with bisphosphonate. Their vitamin K status will be determined and those patients who are found to have low vitamin K concentrations defined as <0.35 ug/ml will be invited to take part in an 18 months prospective randomised placebo controlled trial.
Eligible patients will be randomised to 3 arms (35 patients in each arm). All 3 groups will continue to receive weekly oral bisphosphonate (commonly Alendronate 70 mg weekly) and adjunctive calcium/vitamin D supplements (1.0g of calcium and 800 I.U of cholecalciferol). The control arm (Group A) will receive placebo. Group B will receive 1.0mg daily of vitamin K1 and MK4 placebo. Group C will receive vitamin K2 (MK4) 45 mg daily and vitamin K1 placebo. Patients will be seen at baseline and at 3, 6, 12 and 18 months. Changes in BMD at the lumbar spine, hip, fore-arm at 18 months and the biochemical parameters at each time point will be compared between the groups.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||105 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Triple (Participant, Investigator, Outcomes Assessor)|
|Official Title:||The Additive Effect of Vitamin K Supplementation and Bisphosphonate on Fracture Risk in Post-menopausal Osteoporosis|
|Actual Study Start Date :||April 2015|
|Estimated Primary Completion Date :||March 31, 2020|
|Estimated Study Completion Date :||March 31, 2020|
Active Comparator: Vitamin k1
1.0 mg of vitamin K1 (phylloquinone) and placebo MK4 will be given to one of the treatment arm for 18 months
1.0 mg daily of vitamin K1
Other Name: Vitamin K1
Placebo Comparator: placebo vitamin K1 and MK4
placebo pill of both vitamin K1 and MK4 given for 18 months to the control arm
placebo vitamin K1 and placebo MK4 given daily for 18 months
Other Name: dummy pill
Active Comparator: Menatetrenone MK4
45 mg MK4 given daily and placebo vitamin K1 will be given to one of treatment arm for 18 months
Drug: Menatetrenone (MK4)
Menatetrenone (MK4) 45 mg daily
Other Name: Vitamin K2
- Primary outcome measures- Changes in BMD at the Lumber spine, hip, fore-arm at 18 months. [ Time Frame: 18 months ]Measurement of changes in bone mineral density by DXA scan.
- Secondary outcome measure- Bone Turnover as assessed by the biochemical markers (serum CTX, P1NP, BALP, carboxylated and undercarboxylated osteocalcin (OC), OPG). These markers will be measured at the same time point during each clinic visit. [ Time Frame: 18 months ]Laboratory analyses of serum and/or plasma at baseline, 3, 6, 12 and 18 months.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01232647
|Guy's and St Thomas' Hospital NHS foundation Trust|
|London, United Kingdom, SE1 7EH|
|Osteoporosis Unit, Guy's Hospital|
|London, United Kingdom, SE1 9RT|
|Study Director:||Geeta Hampson, MD||Guy's and St Thomas' NHS Foundation Trust|