Pseudoxanthoma ElasticumPhase 2NCT01525875
Magnesium Supplements In The Treatment Of Pseudoxanthoma Elasticum (PXE)
A Phase 2 study testing Magnesium Oxide in people with Pseudoxanthoma Elasticum, run by Mark Lebwohl at 1 site in United States.
Trial summary
The purpose of this study is to evaluate the effectiveness of magnesium oxide supplements on the reversal of calcium deposits in the skin, and the yellow bumps and folds of skin in subjects with pseudoxanthoma elasticum (PXE). Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Pseudoxanthoma Elasticum
- What is being tested?
- Magnesium Oxide
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 44 participants
- Where
- 1 siteUnited States
- Study dates
- Aug 2012to Mar 2015
- Phase
- Phase 2
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Male or female subject at least 18 years of age
- If female, the subject is not pregnant or nursing
- If female of child bearing potential, the subject has a negative urine pregnancy test at the first visit, and agrees to use an approved method of contraception (hormonal contraceptives [birth control pills, implants [Norplant] or injections [DepoProvera]); intrauterine device (IUD); two forms of barrier methods [condoms and diaphragm]; or abstinence (no sexual activity) throughout the entire study
- Biopsy confirmed diagnosis of pseudoxanthoma elasticum (documenting some calcification of elastic fibers)
- Subject has a clinical disease severity grade of at least "1" (Poorly defined, barely visible macules) at screening.
- Normal kidney function tests
Who cannot join
- Any subject who is pregnant or becomes pregnant during the study
- Subjects with a serum creatinine greater than 1.6 mg/dL
- Subjects with hypermagnesemia, hypokalemia, or idiopathic hypercalciuria
- Subjects with kidney disease or renal tubular defects (eg. Fanconi's syndrome), or on dialysis
- Subjects with hypothyroidism or hypoparathyroidism or primary hyperparathyroidism
- Subjects with acute gout
Show all 13Show fewer
- Subjects with malabsorption, or osteomalacia
- Subjects on diuretics, magnesium containing antacids, or anabolic steroids
- Subjects with Cushing's syndrome
- Subjects receiving lithium and those with significant psychiatric disorders that would likely interfere with participation in this study
- Subjects taking anti-seizures medications and anti-arrhythmics medications
- Subjects on tetracycline or metronidazole and ace inhibitors
- Subjects taking cyclosporine or calcineurin inhibitors
Trial locations and contacts
1 site in 1 country.
United States1 site
Icahn School of Medicine at Mount Sinai
New York, New York, 10029
About this study
The purpose of this study is to evaluate the effectiveness of magnesium oxide supplements on the reversal of calcium deposits in the skin, and the yellow bumps and folds of skin in subjects with pseudoxanthoma elasticum (PXE). Magnesium oxide is a dietary supplement that has been shown in some research to reduce these calcium deposits. This study consists of two parts. The first part is a year-long, double-blind, placebo-controlled study. Part two is an open-label, year-long study. In Part 1, qualified subjects will be randomized to receive either magnesium oxide supplements or placebo, in a 1:1 ratio for the first 12 months. The starting dose will be 1000 mg daily, and depending on tolerability, doses may be decreased. Baseline evaluations will be comprised of: blood tests; clinical evaluations; skin biopsy; eye examination; bone density test; and photography of skin lesions. Subjects will be evaluated at week 2, week 6, month 3, and then every 3 months during the first year. Upon completion of the first year, barring any safety concerns, all subjects will be administered magnesium oxide supplements for up to one additional year. Subjects will undergo the same evaluations/ procedures every 3 months. We hypothesize that the magnesium oxide will cause a reduction in calcifications in the subject's soft tissue/skin. Funding Source - FDA OOPD.
Read the detailed description
Pseudoxanthoma elasticum (PXE) is a systemic connective tissue disorder involving elastic fiber calcification and fragmentation with major clinical manifestations occurring in the cutaneous, ocular and cardiovascular systems.
Calcification of the elastic fibers leads to cracks in Bruch's membrane, an elastic tissue-containing membrane that separates the vascular choroid from the retinal pigment epithelium. These are known as angioid streaks and may be the only sign of the disease for years. Retinal hemorrhage and loss of vision are common. Calcification of the internal elastic lamina of arteries results in gastrointestinal bleeding, sometimes fatal in nature. Accelerated heart disease is an additional complication.
Cutaneous manifestations are characterized by the presence of yellow papules in a cobblestone pattern or plaques resembling "plucked chicken-skin" in flexural regions. Redundant folds of skin may develop in more advanced cases. The most frequent sites of cutaneous involvement include the neck, axillae, inguinal region, antecubital and popliteal fossae and the periumbilical area. Skin lesions provide an easy way of grading degree of calcification of elastic tissue.
A clinical study of 80 subjects with a variety of cutaneous soft tissue mineralization disorders had the affected areas injected locally with magnesium sulfate while also receiving oral magnesium lactate for 4 to 6 months. About 75% of these subjects showed a significant decrease or complete disappearance of calcification.
More recently, a knockout mouse model for PXE has linked a reversal in calcification to a diet high in magnesium. Mice were placed on diets that were either high or low in phosphate, high or low in magnesium, or on a controlled diet. The mice placed on the high magnesium diet did not show any evidence of connective tissue mineralization, while those on the other diets did show mineralization as characterized by calcification of the connective tissue capsule surrounding the vibrissae.
Based on this information and the research linking increased magnesium levels to decreased calcification, we plan to supplement the diets of PXE patients with magnesium oxide in order to show a reduction in elastic fiber calcification in the skin and to slow the progression of the disease.
Randomized subjects will be instructed to take study drug (active or placebo) for 12 months, then all subjects will receive active study drug for the following 12 months.
When ingested through foods, magnesium has not demonstrated any adverse effects. When obtained through supplements, however, excessive magnesium intake has been known to result in diarrhea as well as other gastrointestinal effects such as nausea, and abdominal cramping. Large pharmacological doses of magnesium have been associated with more serious side effects, such as metabolic alkalosis and hypokalemia with the repeated daily ingestion of 30g of magnesium oxide. Hypermagnesemia may result with excessive magnesium supplement ingestion, however, it has rarely been reported in individuals with normal renal function.
Study data will be analyzed using the Wilcoxon Rank Sum Test to compare changes in physician global assessment of skin lesions, evaluation of target lesions and assessment of biopsies between treatment and placebo groups. Assuming a negligible placebo response, we believe power analyses can be performed on our primary measure in 40 completed subjects as proposed in this study. Analyses will be based on intent-to-treat, with the last observation carried forward. Patients who withdraw for safety, lack of efficacy, and generally those without other documentation will in the absence of the requested 'final-visit evaluation' be assigned the highest (worst) score. A finding of significance based on the intent-to-treat analysis would be supplemented with an analysis of patients completing the trial without any protocol deviations.
- Conditions
- Pseudoxanthoma Elasticum
- Being tested
- Magnesium Oxide, Placebo
- Keywords
- pseudoxanthoma elasticum, calcification
- Medical subject headings
- Pseudoxanthoma Elasticum, Calcinosis
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Magnesium OxideDrug
Also called magnesium oxide supplement
Part 1: 1000 mg elemental magnesium (given as one 800 mg capsule of magnesium oxide two times daily).
Part 2: 1500 mg elemental magnesium (given as two 500 mg capsules of magnesium oxide in the morning and three 500 mg capsules of magnesium oxide in the evening).
PlaceboDrug
Also called silica and/or cellulose
1000 mg (one 500 mg capsule two times daily) of placebo.
| Study group | Role | What they receive |
|---|---|---|
| Magnesium oxide | Active comparator | Part 1: 1000 mg elemental magnesium (given as one 800 mg capsule of magnesium oxide two times daily).
Part 2: 1500 mg elemental magnesium (given as two 500 mg capsules of magnesium oxide in the morning and three 500 mg capsules of magnesium oxide in the evening). Receives: Drug: Magnesium Oxide |
| Placebo | Placebo comparator | Part 1: 1000 mg (one 500 mg capsule two times daily) of placebo. Receives: Drug: Placebo |
What is being measured
The primary outcome is the main question the study is designed to answer.
Von Kossa Staining Per Unit Area of Dermis
A blinded dermatopathologist graded skin biopsies on the density of Von Kossa staining, assessed changes in the amount of calcification of elastic fibers by assessing von Kossa staining per unit area of dermis
Measured: up to 2 years
Secondary outcomes (4)
Number of Participants With a 1-point Decrease of Target Lesions
Changes in skin skin lesions observed through investigator evaluations and clinical photographs. The number of patients with a 1-point decrease of target lesions
Measured: up to 2 years
LogMar
Rate of disease progression - Changes observed through ophthalmologic examinations. (+) a decrease in this score indicates improvement of the disease (-) an increase in this score indicates worsening of the disease. LogMAR: logarithm of the minimum angle of resolution. The LogMAR scale converts the geometric sequence of a traditional chart to a linear scale. It measures visual acuity loss: positive values indicate vision loss, while negative values denote normal or better visual acuity.
Measured: 2 years
VAS - Visual Acuity Score
Rate of disease progression observed through ophthalmologic examinations.(+) an increase in this score indicates improvement of the disease (-) a decrease in this score indicates worsening of the disease. VAS ranges from 10 to 200, with higher score indicating poorer visual acuity.
Measured: 2 years
Central Retinal Thickness
Rate of disease progression observed through ophthalmologic examinations. (+) a decrease in this scores indicates improvement of the disease; (-) an increase in this scores indicates improvement of the disease.
Measured: 2 years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted3 Feb 2012 (estimated)
- Study startAug 2012
- Primary completionMar 2015
- Study completionMar 2015
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (17)Papers the sponsor has linked to this study.
- Other trials for Pseudoxanthoma ElasticumStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind
- Who is masked
- Participant, Investigator, Outcomes assessor
- Enrolment
- 44 participants (actual)
Sponsor and investigators
- Lead sponsor
- Mark Lebwohl
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor-investigator, Mark Lebwohl, Icahn School of Medicine at Mount Sinai
- Investigators
- Mark Lebwohl, MD, Principal investigator, Icahn School of Medicine at Mount Sinai
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01525875
- Sponsor's protocol ID
- GCO 09-1157
- Other IDs
- FD-R-0003903
- Status last verified
- Feb 2021
- First submitted
- 1 Feb 2012
- Last updated
- 10 Mar 2021
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- Yes
- Individual data sharing
- No
Publications
Lebwohl M, Neldner K, Pope FM, De Paepe A, Christiano AM, Boyd CD, Uitto J, McKusick VA. Classification of pseudoxanthoma elasticum: report of a consensus conference. J Am Acad Dermatol. 1994 Jan;30(1):103-7. doi: 10.1016/s0190-9622(08)81894-4. No abstract available.
PubMed 8277008Neldner KH. Pseudoxanthoma elasticum. Clin Dermatol. 1988 Jan-Mar;6(1):1-159. doi: 10.1016/0738-081x(88)90003-x. No abstract available.
PubMed 3359381Clarkson JG, Altman RD. Angioid streaks. Surv Ophthalmol. 1982 Mar-Apr;26(5):235-46. doi: 10.1016/0039-6257(82)90158-8.
PubMed 7046115Renie WA, Pyeritz RE, Combs J, Fine SL. Pseudoxanthoma elasticum: high calcium intake in early life correlates with severity. Am J Med Genet. 1984 Oct;19(2):235-44. doi: 10.1002/ajmg.1320190205.
PubMed 6507474Martinez-Hernandez A, Huffer WE, Neldner K, Gordon S, Reeve EB. Resolution and repair of elastic tissue calcification in pseudoxanthoma elasticum. Arch Pathol Lab Med. 1978 Jun;102(6):303-5.
PubMed 580723Sapadin AN, Lebwohl MG, Teich SA, Phelps RG, DiCostanzo D, Cohen SR. Periumbilical pseudoxanthoma elasticum associated with chronic renal failure and angioid streaks--apparent regression with hemodialysis. J Am Acad Dermatol. 1998 Aug;39(2 Pt 2):338-44. doi: 10.1016/s0190-9622(98)70385-8.
PubMed 9703148Sherer DW, Singer G, Uribarri J, Phelps RG, Sapadin AN, Freund KB, Yanuzzi L, Fuchs W, Lebwohl M. Oral phosphate binders in the treatment of pseudoxanthoma elasticum. J Am Acad Dermatol. 2005 Oct;53(4):610-5. doi: 10.1016/j.jaad.2004.11.066.
PubMed 16198780Blum R, Phelps R, Fuchs W, Lebwohl M. Oral Phosphate Binders in the Treatment of Pseudoxanthoma Elasticum. 64th Annual Meeting American Academy of Dermatology March 3-7, 2006, San Francisco, CA. Manuscript in press J Amer Acad Dermatol 2011
Steidl L, Ditmar R. Treatment of soft tissue calcifications with magnesium. Acta Univ Palacki Olomuc Fac Med. 1991;130:273-87.
PubMed 1838878LaRusso J, Li Q, Jiang Q, Uitto J. Elevated dietary magnesium prevents connective tissue mineralization in a mouse model of pseudoxanthoma elasticum (Abcc6(-/-)). J Invest Dermatol. 2009 Jun;129(6):1388-94. doi: 10.1038/jid.2008.391. Epub 2009 Jan 1.
PubMed 19122649Iseri LT, French JH. Magnesium: nature's physiologic calcium blocker. Am Heart J. 1984 Jul;108(1):188-93. doi: 10.1016/0002-8703(84)90572-6. No abstract available.
PubMed 6375330Joffres MR, Reed DM, Yano K. Relationship of magnesium intake and other dietary factors to blood pressure: the Honolulu heart study. Am J Clin Nutr. 1987 Feb;45(2):469-75. doi: 10.1093/ajcn/45.2.469.
PubMed 3812346Paolisso G, Passariello N, Pizza G, Marrazzo G, Giunta R, Sgambato S, Varricchio M, D'Onofrio F. Dietary magnesium supplements improve B-cell response to glucose and arginine in elderly non-insulin dependent diabetic subjects. Acta Endocrinol (Copenh). 1989 Jul;121(1):16-20. doi: 10.1530/acta.0.1210016.
PubMed 2662695Rude RK, Singer FR. Magnesium deficiency and excess. Annu Rev Med. 1981;32:245-59. doi: 10.1146/annurev.me.32.020181.001333. No abstract available.
PubMed 7013665Dietary Reference Intakes for Calcium, Magnesium, Vitamin D and Flouride. IOM Institute of Medicine. 1997 Washington, DC: National Academy Press.
Study at a glance
From the registry record, last updated by the sponsor on 10 Mar 2021. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Magnesium Supplements In The Treatment Of Pseudoxanthoma Elasticum (PXE)
- ClinicalTrials.gov ID
- NCT01525875
- Acronym / sponsor ID
- GCO 09-1157
- Conditions
- Pseudoxanthoma Elasticum
- Keywords
- pseudoxanthoma elasticum, calcification
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 44 participants (actual)
- Lead sponsor
- Mark LebwohlUniversity, hospital or other
- Study start
- Aug 2012
- Primary completion
- Mar 2015 (actual)
- Study completion
- Mar 2015 (actual)
- First posted
- 3 Feb 2012 (estimated)
- Results
- Posted 25 Apr 2019
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study is to evaluate the effectiveness of magnesium oxide supplements on the reversal of calcium deposits in the skin, and the yellow bumps and folds of skin in subjects with pseudoxanthoma elasticum (PXE). Magnesium oxide is a dietary supplement that has been shown in some research to reduce these calcium deposits. This study consists of two parts. The first part is a year-long, double-blind, placebo-controlled study. Part two is an open-label, year-long study. In Part 1, qualified subjects will be randomized to receive either magnesium oxide supplements or placebo, in a 1:1 ratio for the first 12 months. The starting dose will be 1000 mg daily, and depending on tolerability, doses may be decreased. Baseline evaluations will be comprised of: blood tests; clinical evaluations; skin biopsy; eye examination; bone density test; and photography of skin lesions. Subjects will be evaluated at week 2, week 6, month 3, and then every 3 months during the first year. Upon completion of the first year, barring any safety concerns, all subjects will be administered magnesium oxide supplements for up to one additional year. Subjects will undergo the same evaluations/ procedures every 3 months. We hypothesize that the magnesium oxide will cause a reduction in calcifications in the subject's soft tissue/skin. Funding Source - FDA OOPD.
Detailed description
Pseudoxanthoma elasticum (PXE) is a systemic connective tissue disorder involving elastic fiber calcification and fragmentation with major clinical manifestations occurring in the cutaneous, ocular and cardiovascular systems.
Calcification of the elastic fibers leads to cracks in Bruch's membrane, an elastic tissue-containing membrane that separates the vascular choroid from the retinal pigment epithelium. These are known as angioid streaks and may be the only sign of the disease for years. Retinal hemorrhage and loss of vision are common. Calcification of the internal elastic lamina of arteries results in gastrointestinal bleeding, sometimes fatal in nature. Accelerated heart disease is an additional complication.
Cutaneous manifestations are characterized by the presence of yellow papules in a cobblestone pattern or plaques resembling "plucked chicken-skin" in flexural regions. Redundant folds of skin may develop in more advanced cases. The most frequent sites of cutaneous involvement include the neck, axillae, inguinal region, antecubital and popliteal fossae and the periumbilical area. Skin lesions provide an easy way of grading degree of calcification of elastic tissue.
A clinical study of 80 subjects with a variety of cutaneous soft tissue mineralization disorders had the affected areas injected locally with magnesium sulfate while also receiving oral magnesium lactate for 4 to 6 months. About 75% of these subjects showed a significant decrease or complete disappearance of calcification.
More recently, a knockout mouse model for PXE has linked a reversal in calcification to a diet high in magnesium. Mice were placed on diets that were either high or low in phosphate, high or low in magnesium, or on a controlled diet. The mice placed on the high magnesium diet did not show any evidence of connective tissue mineralization, while those on the other diets did show mineralization as characterized by calcification of the connective tissue capsule surrounding the vibrissae.
Based on this information and the research linking increased magnesium levels to decreased calcification, we plan to supplement the diets of PXE patients with magnesium oxide in order to show a reduction in elastic fiber calcification in the skin and to slow the progression of the disease.
Randomized subjects will be instructed to take study drug (active or placebo) for 12 months, then all subjects will receive active study drug for the following 12 months.
When ingested through foods, magnesium has not demonstrated any adverse effects. When obtained through supplements, however, excessive magnesium intake has been known to result in diarrhea as well as other gastrointestinal effects such as nausea, and abdominal cramping. Large pharmacological doses of magnesium have been associated with more serious side effects, such as metabolic alkalosis and hypokalemia with the repeated daily ingestion of 30g of magnesium oxide. Hypermagnesemia may result with excessive magnesium supplement ingestion, however, it has rarely been reported in individuals with normal renal function.
Study data will be analyzed using the Wilcoxon Rank Sum Test to compare changes in physician global assessment of skin lesions, evaluation of target lesions and assessment of biopsies between treatment and placebo groups. Assuming a negligible placebo response, we believe power analyses can be performed on our primary measure in 40 completed subjects as proposed in this study. Analyses will be based on intent-to-treat, with the last observation carried forward. Patients who withdraw for safety, lack of efficacy, and generally those without other documentation will in the absence of the requested 'final-visit evaluation' be assigned the highest (worst) score. A finding of significance based on the intent-to-treat analysis would be supplemented with an analysis of patients completing the trial without any protocol deviations.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (participant, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Magnesium oxide | Active comparator | Drug: Magnesium OxidePart 1: 1000 mg elemental magnesium (given as one 800 mg capsule of magnesium oxide two times daily). Part 2: 1500 mg elemental magnesium (given as two 500 mg capsules of magnesium oxide in the morning and three 500 mg capsules of magnesium oxide in the evening). |
| Placebo | Placebo comparator | Drug: PlaceboPart 1: 1000 mg (one 500 mg capsule two times daily) of placebo. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (6 listed)
- Male or female subject at least 18 years of age
- If female, the subject is not pregnant or nursing
- If female of child bearing potential, the subject has a negative urine pregnancy test at the first visit, and agrees to use an approved method of contraception (hormonal contraceptives [birth control pills, implants [Norplant] or injections [DepoProvera]); intrauterine device (IUD); two forms of barrier methods [condoms and diaphragm]; or abstinence (no sexual activity) throughout the entire study
- Biopsy confirmed diagnosis of pseudoxanthoma elasticum (documenting some calcification of elastic fibers)
- Subject has a clinical disease severity grade of at least "1" (Poorly defined, barely visible macules) at screening.
Key exclusion criteria (13 listed)
- Any subject who is pregnant or becomes pregnant during the study
- Subjects with a serum creatinine greater than 1.6 mg/dL
- Subjects with hypermagnesemia, hypokalemia, or idiopathic hypercalciuria
- Subjects with kidney disease or renal tubular defects (eg. Fanconi's syndrome), or on dialysis
- Subjects with hypothyroidism or hypoparathyroidism or primary hyperparathyroidism
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Magnesium OxideAlso: magnesium oxide supplementPart 1: 1000 mg elemental magnesium (given as one 800 mg capsule of magnesium oxide two times daily). Part 2: 1500 mg elemental magnesium (given as two 500 mg capsules of magnesium oxide in the morning and three 500 mg capsules of magnesium oxide in the evening). | Drug | Magnesium oxide |
| PlaceboAlso: silica and/or cellulose1000 mg (one 500 mg capsule two times daily) of placebo. | Drug | Placebo |
Primary outcome
Von Kossa Staining Per Unit Area of Dermis
Time frame: up to 2 years
A blinded dermatopathologist graded skin biopsies on the density of Von Kossa staining, assessed changes in the amount of calcification of elastic fibers by assessing von Kossa staining per unit area of dermis
4 secondary outcomes
Number of Participants With a 1-point Decrease of Target Lesions
Time frame: up to 2 years
LogMar
Time frame: 2 years
VAS - Visual Acuity Score
Time frame: 2 years
Central Retinal Thickness
Time frame: 2 years
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 10 Mar 2021.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Background: PubMed 8277008Lebwohl M, Neldner K, Pope FM, De Paepe A, Christiano AM, Boyd CD, Uitto J, McKusick VA. Classification of pseudoxanthoma elasticum: report of a consensus conference. J Am Acad Dermatol. 1994 Jan;30(1):103-7. doi: 10.1016/s0190-9622(08)81894-4. No abstract available.
- Background: PubMed 3359381Neldner KH. Pseudoxanthoma elasticum. Clin Dermatol. 1988 Jan-Mar;6(1):1-159. doi: 10.1016/0738-081x(88)90003-x. No abstract available.
- Background: PubMed 7046115Clarkson JG, Altman RD. Angioid streaks. Surv Ophthalmol. 1982 Mar-Apr;26(5):235-46. doi: 10.1016/0039-6257(82)90158-8.
- Background: PubMed 6507474Renie WA, Pyeritz RE, Combs J, Fine SL. Pseudoxanthoma elasticum: high calcium intake in early life correlates with severity. Am J Med Genet. 1984 Oct;19(2):235-44. doi: 10.1002/ajmg.1320190205.
- Background: PubMed 580723Martinez-Hernandez A, Huffer WE, Neldner K, Gordon S, Reeve EB. Resolution and repair of elastic tissue calcification in pseudoxanthoma elasticum. Arch Pathol Lab Med. 1978 Jun;102(6):303-5.
- Background: PubMed 9703148Sapadin AN, Lebwohl MG, Teich SA, Phelps RG, DiCostanzo D, Cohen SR. Periumbilical pseudoxanthoma elasticum associated with chronic renal failure and angioid streaks--apparent regression with hemodialysis. J Am Acad Dermatol. 1998 Aug;39(2 Pt 2):338-44. doi: 10.1016/s0190-9622(98)70385-8.
- Background: PubMed 16198780Sherer DW, Singer G, Uribarri J, Phelps RG, Sapadin AN, Freund KB, Yanuzzi L, Fuchs W, Lebwohl M. Oral phosphate binders in the treatment of pseudoxanthoma elasticum. J Am Acad Dermatol. 2005 Oct;53(4):610-5. doi: 10.1016/j.jaad.2004.11.066.
- BackgroundBlum R, Phelps R, Fuchs W, Lebwohl M. Oral Phosphate Binders in the Treatment of Pseudoxanthoma Elasticum. 64th Annual Meeting American Academy of Dermatology March 3-7, 2006, San Francisco, CA. Manuscript in press J Amer Acad Dermatol 2011
- Background: PubMed 1838878Steidl L, Ditmar R. Treatment of soft tissue calcifications with magnesium. Acta Univ Palacki Olomuc Fac Med. 1991;130:273-87.
- Background: PubMed 19122649LaRusso J, Li Q, Jiang Q, Uitto J. Elevated dietary magnesium prevents connective tissue mineralization in a mouse model of pseudoxanthoma elasticum (Abcc6(-/-)). J Invest Dermatol. 2009 Jun;129(6):1388-94. doi: 10.1038/jid.2008.391. Epub 2009 Jan 1.
- Background: PubMed 6375330Iseri LT, French JH. Magnesium: nature's physiologic calcium blocker. Am Heart J. 1984 Jul;108(1):188-93. doi: 10.1016/0002-8703(84)90572-6. No abstract available.
- Background: PubMed 3812346Joffres MR, Reed DM, Yano K. Relationship of magnesium intake and other dietary factors to blood pressure: the Honolulu heart study. Am J Clin Nutr. 1987 Feb;45(2):469-75. doi: 10.1093/ajcn/45.2.469.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Mark Lebwohl, MD principal investigator
Icahn School of Medicine at Mount Sinai
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing Magnesium Oxide in people with Pseudoxanthoma Elasticum, run by Mark Lebwohl at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 6 inclusion and 13 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 10 Mar 2021. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Yes. Results are posted in the registry (first posted 25 Apr 2019). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Von Kossa Staining Per Unit Area of Dermis (time frame: up to 2 years). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT01525875, which also lists 17 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 10 Mar 2021.