Highlights
- •PARP inhibitors significantly increased the risk of pneumonitis across 16 RCTs with a high proportion of severe cases.
- •In addition to olaparib having the most significant pneumonitis signal, a pneumonitis signal was also detected for niraparib.
- •Most of the PARP inhibitor-related pneumonitis occurred early during treatment course.
- •PARP inhibitor-related pneumonitis can result in serious outcomes with a fatality rate of 16%.
Abstract
Objective/Background
We aimed to evaluate the risk of PARP inhibitors (PARPis) causing pneumonitis in randomized
controlled trials (RCTs) and in the real-world practice.
Methods
First, a systematic review based on meta-analysis was conducted. RCTs with available
data reporting pneumonitis events for PARPis were eligible for analysis. Second, we
conducted a disproportionality analysis based on data from the FDA Adverse Event Reporting
System (FAERS) database to characterize the main features of PARPi-related pneumonitis.
Results
16 trials with 5771 patients were included in our meta-analysis. Compared with control
arms, PARPis showed a significant increase in the risk of pneumonitis events (Peto
OR 2.68 [95% CI 1.31–5.47], p = 0.007) with no heterogeneity (I2 = 0%, χ2 p = 0.70). The incidence of pneumonitis across treatment arms was 0.79% (28/3551).
In the FAERS database, we identified 84 cases of PARPi-pneumonitis with a fatality
rate of 16% (13/79). The median time to event onset was 81 (interquartile range [IQR]
27–131) days and 87% of the adverse events occurred within 6 months.
Conclusion
PARPis increased the risk of pneumonitis that can result in serious outcomes and tend
to occur early. Early recognition and management of PARPi-pneumonitis is of vital
importance in clinical practice. The mechanisms and risk factors should be studied
further to improve clinical understanding and innovative treatment strategies for
these diseases.
Graphical abstract

Graphical Abstract
Keywords
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Article info
Publication history
Published online: May 19, 2021
Accepted:
May 12,
2021
Received:
March 10,
2021
Identification
Copyright
© 2021 Published by Elsevier Inc.