Longitudinal FEV1 and Exacerbation Risk in COPD: Quantifying the Association Using Joint Modelling.
Kirill Zhudenkov1, Robert Palmér2, Alexandra Jauhiainen3
1M&S Decisions LLC, Moscow, Russia.
International Journal of Chronic Obstructive Pulmonary Disease
|January 25, 2021
Summary
Joint modeling in chronic obstructive pulmonary disease (COPD) trials shows lung function improvements correlate with reduced exacerbation risk. However, the impact of lung function alone on exacerbation risk reduction in COPD trials is minimal.
Area of Science:
- Pulmonary Medicine
- Clinical Trial Methodology
- Biostatistics
Background:
- Chronic obstructive pulmonary disease (COPD) clinical trials commonly assess lung function (FEV1) and exacerbations as separate endpoints.
- Joint analysis of FEV1 and exacerbations may enhance statistical power and efficiency in COPD trials.
Purpose of the Study:
- To evaluate joint modeling for analyzing treatment effects in COPD clinical trials.
- To quantify the association between longitudinal FEV1 improvements and exacerbation risk reduction.
Main Methods:
- A joint model was developed using patient data from a Phase III COPD trial (1740 patients) assessing formoterol and budesonide.
- The model was validated and parameters re-estimated using two additional studies (1604 and 1042 patients).
Main Results:
- A significant association (p<0.0001) was found between FEV1 and exacerbation risk, with ~10% risk reduction per 100 mL FEV1 increase.
- This FEV1-associated risk reduction was modest compared to treatment effects (e.g., budesonide).
- Baseline breathlessness and prior exacerbations were also significant predictors of exacerbation risk.
Conclusions:
- Joint modeling effectively co-analyzes longitudinal FEV1 and exacerbation data in COPD trials.
- Improved lung function (FEV1) indicates reduced exacerbation risk, independent of treatment mechanism.
- FEV1 improvement alone offers limited impact on exacerbation trial design; other endpoints warrant exploration.
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