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Long-term changes in pulmonary function tests after definitive radiotherapy for lung cancer
Keith L Miller1, Su-Min Zhou, Robert C Barrier
1Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710, USA.
Summary
Radiotherapy for lung cancer caused a decline in pulmonary function tests (PFTs) that continued beyond one year, suggesting progressive lung injury and late respiratory symptoms in survivors.
Area of Science:
- Pulmonary Medicine
- Radiation Oncology
- Oncology
Background:
- Unresectable lung cancer necessitates definitive radiotherapy (RT).
- Long-term pulmonary function changes after RT are not well-characterized.
Purpose of the Study:
- To evaluate long-term changes in pulmonary function tests (PFTs) in patients surviving at least 2 years after definitive RT for unresectable lung cancer.
Main Methods:
- Prospective study of 13 lung cancer patients with >2 years follow-up post-RT.
- Pulmonary function tests (PFTs) measured pre-RT and ~6 months intervals.
- Results analyzed as percentage of predicted normal values and compared to baseline.
Main Results:
- PFTs declined by 6 months, stabilizing by 1 year, then gradually reducing thereafter.
- 77% of patients developed RT-induced respiratory symptoms (dyspnea, cough) between 2-21 months post-RT.
- Some patients required inhalers, steroids, or oxygen; no deaths from RT-induced pulmonary insufficiency.
Conclusions:
- RT leads to sustained decline in PFTs beyond 1 year, indicating progressive lung injury.
- Late pulmonary symptoms are common in long-term survivors.
- Further multi-institutional studies are needed to clarify long-term RT effects on pulmonary function.