# Clinical Validation of an Immunocytochemistry Method Using MARS1

> **NCT04759794** · NA · COMPLETED · sponsor: **Gangnam Severance Hospital** · enrollment: 55 (actual)

## Conditions studied

- Bile Duct Obstruction, Extrahepatic

## Interventions

- **DIAGNOSTIC_TEST:** Cytology staining

## Key facts

- **NCT ID:** NCT04759794
- **Lead sponsor:** Gangnam Severance Hospital
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2021-02-04
- **Primary completion:** 2023-02-03
- **Final completion:** 2023-02-03
- **Target enrollment:** 55 (ACTUAL)
- **Last updated:** 2025-03-13


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04759794

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04759794, "Clinical Validation of an Immunocytochemistry Method Using MARS1". Retrieved via AI Analytics 2026-06-25 from https://api.ai-analytics.org/clinical/NCT04759794. Licensed CC0.

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