Autoantibodies to Gastric Parietal Cells in Rheumatoid Arthritis Patients
A review of the literature reveals that very few studies have assessed the potential co-existence of vitamin B12 deficiency due to gastric parietal cell autoantibodies. While Segal et al. in 2004 published a study which found that 49% of patients with RA had vitamin B12 deficiency, no assessment of the etiology or the presence of autoantibodies was made. While Goeldner et al. in 2011 and Datta et al. in 1990 demonstrated that anti-gastric parietal cell antibodies (anti-GPC Ab) were found in <5% to 28% of RA patients respectively, no additional testing was implemented to determine the significance, specifically whether or not the presence of anti-GPC Ab related to vitamin B12 deficiency.
The purpose of this study is to determine the prevalence and metabolic significance of anti-GPC Ab in three cohorts: (1) a group of patients with Rheumatoid Arthritis, (2) a group of patients with autoimmune thyroid disease (AITD), and (3) a group of patients with neither RA or AITD. To determine the significance of the presence of anti-GPC Ab, testing of the current serum B12 level along with a metabolite dependent on adequate vitamin B12 levels (Methylmalonic acid) will be tested.
Vitamin B12 Deficiency
|Study Design:||Observational Model: Case Control
Time Perspective: Cross-Sectional
|Official Title:||Presence of Autoantibodies to Gastric Parietal Cells and Subsequent Vitamin B12 Deficiency in Rheumatoid Arthritis Patients|
- Prevalence of Vitamin B12 Deficiency [ Time Frame: 7 months ] [ Designated as safety issue: No ]Hypothesis: Evidence of serum vitamin B12 deficiency, as measure by either a low vitamin B12 level or elevated methylmalonic acid, will be more common in RA patients with anti-GPC Ab.
- Presence of Anti-GPC Antibodies [ Time Frame: 7 months ] [ Designated as safety issue: No ]Hypothesis: Evidence of anti-GPC Ab in a group of patients with RA will be more prevalent as compared to a group of patients with AITD and with no known systemic or organ specific autoimmune condition.
|Study Start Date:||June 2013|
|Study Completion Date:||April 2015|
|Primary Completion Date:||April 2015 (Final data collection date for primary outcome measure)|
Patients with seropositive or seronegative Rheumatoid Arthritis
Autoimmune Thyroid Disease (AITD)
Participants with autoimmune thyroid disease without other known systemic or organ specific autoimmune illnesses.
Participants without Rheumatoid Arthritis, AITD, or other systemic or organ specific autoimmune illnesses
Background: Organ specific antibodies such as anti-gastric parietal cell antibodies (anti-GPC Ab) have been found in a variable number of patients with RA, but it is unclear what significance these antibodies have on actual vitamin B12 levels. Patients with RA have been found to have vitamin B12 deficiency up to near 50% but it is unclear if this deficiency is due to anti-GPC Ab.
Hypothesis: By virtue of the aberrant autoimmune process that occurs in RA, patients with RA are more likely to have anti-GPC Ab and more likely than a control arm or participants with autoimmune thyroid disease (AITD) to have vitamin B12 deficiency.
Method: 135 patients will be consented; 45 to the RA arm, 45 to an AITD arm, and 45 to a control arm. Exclusion criteria will filter patients who would have other reasons for altered vitamin B12 absorption, such as inflammatory bowel disease, surgery, or medication use. After obtaining consent subjects will be sent to lab a serum anti-GPC Ab test (obtainable in an SLE panel), RF, B12/folate (as available for ordering in CHCS), methyl malonic acid, and (for the control arm subjects and AITD subjects) an anti-CCP IgG. Patients will also complete a one-sided, one page questionnaire asking them about dietary and medication exposures.
Outcomes: (1) Determine whether evidence of serum vitamin B12 deficiency, as measure by either a low vitamin B12 level or elevated methylmalonic acid, will be more common in RA patients with anti-GPC Ab. (2) Determine the prevalence of anti-GPC Ab in a group of patients with RA as compared to a group of patients with AITD and with no known systemic or organ specific autoimmune condition.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01876329
|United States, Mississippi|
|Keesler Medical Center|
|Keesler AFB, Mississippi, United States, 39534|
|Principal Investigator:||Matthew B Carroll, MD||Keesler Medical Center|