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Variability of bronchial inflammation in chronic obstructive pulmonary disease: implications for study design
1Lung Pathology, Imperial College at the Royal Brompton Hospital, London, UK.
The European Respiratory Journal
|February 3, 2006
Summary
Sampling airway biopsies from multiple generations improves chronic obstructive pulmonary disease (COPD) studies. Examining more airway generations increases statistical power to detect differences in inflammatory cells like CD8+ cells.
Area of Science:
- Pulmonary Medicine
- Immunology
- Biostatistics
Background:
- Chronic obstructive pulmonary disease (COPD) is characterized by inflammatory cell infiltration in the airways.
- Variability in inflammatory cell distribution complicates the interpretation of clinical trial data.
Purpose of the Study:
- To investigate sources of biological variability in quantifying inflammatory cells in endobronchial biopsies from COPD patients.
- To determine optimal biopsy sampling strategies to maximize statistical power in COPD research.
Main Methods:
- Analysis of immunostained endobronchial biopsies from 51 COPD subjects.
- Quantification of inflammatory cells, focusing on CD8+ T-cells.
- Assessment of variance contributions from time, airway generation, biopsy, zone, and section.
- Power calculations for different sampling scenarios.
Main Results:
- Time (10 weeks) was the largest source of intra-subject variability (39%) for CD8+ cells.
- Airway generation contributed significantly to variability (23%).
- Sampling from two airway generations required 32 subjects per group versus 47 for one generation to detect a twofold change in CD8+ cells.
Conclusions:
- Biopsies from multiple airway generations are crucial for enhancing statistical power in COPD clinical trials.
- Optimized biopsy sampling strategies can improve the detection of treatment effects by accounting for biological variability.
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