Primary Hyperparathyroidism (PHPT): Early Effect of Vitamin D - Full Text View

Purpose

Primary hyperparathyroidism (PHPT) is a common disease that occurs in 1 in 10,000 people every year. In the presence of this condition, the parathyroid glands produce excessive amounts of parathyroid hormone (PTH), which regulates calcium levels. The high levels of parathyroid hormone remove too much calcium from bones, and then deposit the excess calcium in the blood, which is then filtered into the urine by the kidneys. Bone health is threatened by excess calcium loss which weakens bone structure. Other affected organs include the skeleton (calcium loss leads to a "weakening" of the skeleton), and the kidneys (high blood calcium can lead to kidney stones).

It is now evident that the majority of patients with even mild Primary Hyperparathyroidism are vitamin D deficient. In 2009, new international guidelines for the management of asymptomatic PHPT direct physicians to measure 25-hydroxyvitamin D (D3 or 25-OHD) in all patients, and to replete the reserve of vitamin D when the level is low (< 20 ng/ml). However, no recommendations for vitamin D repletion are given, because of limited data regarding the effects of vitamin D repletion, appropriate dosing and safety. Therefore, there is an urgent need for data upon which to base such recommendations, as well as are data on the effects of such treatment upon bones.

Subjects with low vitamin D3 levels will be selected for this trial. They will be given enough vitamin D3 to raise their low blood levels from a low to a normal range. The assessments in this study, including the quadruple label bone biopsy, will allow us to document the short term effects of administering vitamin D3 on changes in bone.

All participants enrolled in this trial will be vitamin D3 deficient. Participants will take an antibiotic (tetracycline) 4 times a day to mark the starting point from which bone changes will be assessed. After 3 days of tetracycline, a 12 week course of vitamin D3 or placebo will be initiated. Six of 7 participants will receive the study drug (active vitamin D3), while 1 in 7 will receive a placebo (sugar pill). Ten weeks later, another 3-day course of tetracycline will be given. At the end of 12 weeks, a bone biopsy will be done. A small piece of bone (about the size of a pencil eraser) will be removed from the hip (iliac crest). The bone will be analyzed to determine the effect of vitamin D3 on primary hyperparathyroidism.

There will be 4 study visits: Screening, Baseline, Week 8, and Week 12 when the bone biopsy will be performed.

Study Procedures:

Medical and Social History

Blood tests (drawn at the study center and local Quest Lab)

24-Hour urine collection for calcium and creatinine excretion

Abdominal X-ray (to assess for kidney stones)

Transiliac crest Bone Biopsy

Condition	Intervention	Phase
Primary Hyperparathyroidism Hypercalcemia Vitamin D Deficiency Osteoporosis Osteopenia	Dietary Supplement: Placebo Dietary Supplement: Vitamin D3	Phase 2 Phase 3


Study Type:	Interventional
Study Design:	Allocation: Randomized Intervention Model: Parallel Assignment Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Official Title:	Early Effect of Vitamin D in Primary Hyperparathyroidism

Resource links provided by NLM:

Genetics Home Reference related topics: familial isolated hyperparathyroidism hyperparathyroidism-jaw tumor syndrome

MedlinePlus related topics: Vitamin D

Drug Information available for: Cholecalciferol Vitamin D

Genetic and Rare Diseases Information Center resources: Primary Hyperparathyroidism

U.S. FDA Resources

Further study details as provided by Shonni J. Silverberg, Columbia University:

Primary Outcome Measures:

Change in Bone Formation Rate (BFR) [ Time Frame: 12 Weeks ]
A between group (vitamin D3 vs. placebo) comparison of BFR will be performed at three surfaces, cancellous, intra- and endo-cortical.


Enrollment:	0
Study Start Date:	May 2010
Study Completion Date:	January 2015
Primary Completion Date:	January 2015 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
Experimental: 50,000 IU Vitamin D3	Dietary Supplement: Vitamin D3 Baseline: 50,000 IU/week for 8 weeks Week 8: Subjects with D3 less than 30 ng/ml: 50,000 IU/week for 4 weeks. Subjects with D3 25-OHD at or above 30 ng/ml: 50,000 IU/every 2 weeks for 4 weeks.
Placebo Comparator: Placebo (inactive Vitamin D3)	Dietary Supplement: Placebo Subjects will receive placebo vitamin D3, 1 pill weekly for 12 weeks.

Eligibility


Ages Eligible for Study:	45 Years and older (Adult, Senior)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	No

Criteria

Inclusion Criteria:

Females and males >= 45 years of age
PHPT, defined as elevated PTH with elevated serum calcium
Screening 25-OHD <= 20 ng/ml

Exclusion Criteria:

Pre-menopausal
Serum calcium is >11.5mg/dl.
Urinary calcium is >350 mg/dl.
Active nephrolithiasis
Nephocalcinosis
Known sensitivity to tetracycline (Sumycin)
Familial history of hyperparathyroid syndromes
Bisphosphonate use within past 2 years.
Current use of Prolia.
Current use of Cinacalcet.
Currently using Cimetidine.
Currently use Colestipol.
Currently using Orlistat.
Current or past malignancy, except cured basal or squamous cell skin carcinoma or other cancers that have not recurred for at least five years.
Current tuberculosis, or history of Sarcoidosis, HIV/AIDS, chronic kidney disease (serum creatinine >= 1.5), liver disease, Crohn's Disease, Celiac Disease, or gastric bypass

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01329666

Locations


United States, New York
Columbia University Medical Center
New York, New York, United States, 10032

Sponsors and Collaborators

Columbia University

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

Investigators


Principal Investigator:	Shonni J. Silverberg, MD	Columbia University

More Information


Responsible Party:	Shonni J. Silverberg, Professor of Medicine, Endocrinology, Columbia University
ClinicalTrials.gov Identifier:	NCT01329666 History of Changes
Other Study ID Numbers:	AAAF1846 R01DK084986 ( U.S. NIH Grant/Contract )
Study First Received:	April 4, 2011
Last Updated:	March 4, 2015

Keywords provided by Shonni J. Silverberg, Columbia University:


Primary Hyperparathyroidism Endocrinology Hypercalcemia Vitamin D deficiency Parathyroid Hormone	Osteoporosis Bone Density Vitamin D repletion Vitamin D Supplements

Additional relevant MeSH terms:


Hyperparathyroidism, Primary Osteoporosis Hyperparathyroidism Vitamin D Deficiency Bone Diseases, Metabolic Hypercalcemia Bone Diseases Musculoskeletal Diseases Parathyroid Diseases Endocrine System Diseases Avitaminosis Deficiency Diseases Malnutrition	Nutrition Disorders Calcium Metabolism Disorders Metabolic Diseases Water-Electrolyte Imbalance Vitamins Vitamin D Ergocalciferols Cholecalciferol Micronutrients Growth Substances Physiological Effects of Drugs Bone Density Conservation Agents

ClinicalTrials.gov processed this record on July 24, 2017