# Sputum Studies of Anti-Citrullinated Protein Antibodies (ACPA) and Rheumatoid Arthritis (RA) Origins

> **NCT04474392** · — · UNKNOWN · sponsor: **University of Colorado, Denver** · enrollment: 340 (estimated)

## Conditions studied

- Rheumatoid Arthritis

## Interventions

- **OTHER:** N/A (Observational Study)

## Key facts

- **NCT ID:** NCT04474392
- **Lead sponsor:** University of Colorado, Denver
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** UNKNOWN
- **Start date:** 2020-08-01
- **Primary completion:** 2025-07-14
- **Final completion:** 2025-07-14
- **Target enrollment:** 340 (ESTIMATED)
- **Last updated:** 2022-06-14

## Collaborators

- [object Object]
- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04474392

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04474392, "Sputum Studies of Anti-Citrullinated Protein Antibodies (ACPA) and Rheumatoid Arthritis (RA) Origins". Retrieved via AI Analytics 2026-06-05 from https://api.ai-analytics.org/clinical/NCT04474392. Licensed CC0.

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