---
title: Identification of Markers for Determining the Efficacy of Vitamin D Receptor Activator Therapy in Stage 3/4 CKD Patients
nct_id: NCT02018133
overall_status: COMPLETED
sponsor: University of Illinois at Chicago
study_type: OBSERVATIONAL
primary_condition: CKD Stage 3/4
countries: United States
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT02018133.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT02018133"
ct_last_update_post_date: 2020-08-17
last_seen_at: "2026-05-12T06:42:16.185Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Identification of Markers for Determining the Efficacy of Vitamin D Receptor Activator Therapy in Stage 3/4 CKD Patients

**NCT ID:** [NCT02018133](https://clinicaltrials.gov/study/NCT02018133)

## Key Facts

- **Status:** COMPLETED
- **Study Type:** OBSERVATIONAL
- **Target Enrollment:** 8
- **Lead Sponsor:** University of Illinois at Chicago
- **Collaborators:** Abbott
- **Conditions:** CKD Stage 3/4
- **Start Date:** 2009-12
- **Completion Date:** 2012-06
- **CT.gov Last Update:** 2020-08-17

## Brief Summary

The purpose of this study is to identify genes that are responsive to paricalcitol (active vitamin D) therapy. Scientists have found that over 30 different types of cells in the body respond to vitamin D therapy, including blood vessels. Low levels of vitamin D may reduce the amount of calcium in the blood, increase the amount of parathyroid hormone (PTH) and cause the parathyroid gland (small gland located in the neck) to get bigger which is called secondary hyperparathyroidism (SHPT). Also, low levels of vitamin D may worsen the heart disease seen in dialysis patients. Paricalcitol, a man-made active vitamin D, is a replacement for vitamin D for preventing and treating SHPT. Studies that followed patients on dialysis have found: (1) differences in death rates between those who received active vitamin D compared with no activated vitamin D, and (2) a survival benefit in chronic kidney disease (CKD) patients receiving paricalcitol, over calcitriol (natural active vitamin D). Researchers have considered that giving paricalcitol to people with (CKD) may also prevent or slow the progression of heart disease.

Currently, physicians can only tell how well the vitamin D is working by measuring PTH concentrations. This study aims to identify markers in the blood that can be used to determine the efficacy of Vitamin D therapy.

## Detailed Description

After baseline information and laboratory tests are obtained, subjects will be randomized to receive either oral paricalcitol at 2 mcg daily for 2 weeks or placebo. After a washout period of 4 weeks, those subjects who received paricalcitol will receive placebo for 2 weeks and those who received placebo will receive paricalcitol for 2 weeks. A simple blood draw will be obtained from the patient on days 0, 1, and 14 of each treatment arm, and they will also be assessed for side effects at the end of each treatment.

The blood obtained during these visits will be analyzed for any changes that may have occurred in the white blood cells (WBC) and/or plasma. These samples will be tested to see if there are any markers in the blood that changed after treatment with vitamin D. The samples collected will be temporarily stored in the research laboratory and subsequently sent to a separate laboratory (Genus Systems Company) in batches for analysis.

## Eligibility

- **Minimum age:** 18 Years
- **Sex:** ALL
- **Healthy Volunteers:** No

```
Inclusion Criteria:

* Chronic kidney disease stage 3/4
* PTH: \>70 pg/ml
* If on ACEI/ARB, optimized and stable dose

Exclusion Criteria:

* Failure to provide informed consent
* Prior active vitamin D oral or parenteral treatment, including calcitriol, paricalcitol and doxercalciferol
* Glomerulonephritis requiring active treatment with immunosuppressive therapy
* Serum phosphorus: \> 5.2 mg/dL
* Serum calcium (corrected for albumin): \> 10.0 mg/dL
* Clinical unstable medical conditions (other than CKD)
* Use of any investigational drug within the past 30 days or 5 half-lives, whichever is longer
* History of malignancy, other than basal cell carcinoma of the skin
* History of hypersensitivity to vitamin D or its analogs
* Pregnant or nursing (lactating) women
* Women of child-bearing potential
```

## Arms

- **Vitamin D or Placebo** — Take vitamin D for 2 weeks. 2mg daily before meal

## Interventions

- **Vitamin D 2mg daily for 2 weeks oral paricalcitol** (DRUG) — vitamin D 2 capsules daily
- **Placebo** (DRUG) — placebo 2 capsule daily

## Primary Outcomes

- **examine the gene expression pattern in white blood cells obtained from Stage 3/4 CKD patients before and after paricalcitol treatment** _(time frame: 2 weeks)_ — determine gene expression

## Locations (1)

- University of Illinois at Chicago, Chicago, Illinois, United States

## Recent Field Changes (last 30 days)

- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `sponsor.collaborators` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `locations.university of illinois at chicago|chicago|illinois|united states` — added _(2026-05-12)_

---

*Canonical: https://parkinsonspathways.com/agent/trials/NCT02018133.md*  
*Source data (authoritative): https://clinicaltrials.gov/study/NCT02018133*  
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