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CT screening for lung cancer: five-year prospective experience
Stephen J Swensen1, James R Jett, Thomas E Hartman
1Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA. swensen.stephen@mayo.edu
Radiology
|February 8, 2005
Summary
Low-dose computed tomography (CT) detects early lung cancers in high-risk individuals. However, this 5-year study found no significant shift towards earlier stage detection or reduced lung cancer mortality compared to historical data.
Area of Science:
- Oncology
- Radiology
- Pulmonology
Background:
- Lung cancer remains a leading cause of cancer death worldwide.
- Early detection significantly improves patient outcomes.
- High-risk populations, such as long-term smokers, benefit most from screening.
Purpose of the Study:
- To evaluate the efficacy of a 5-year prospective low-dose helical chest computed tomographic (CT) screening program.
- To assess the impact of CT screening on the stage at diagnosis for lung cancer.
- To compare lung cancer mortality rates with historical data.
Main Methods:
- 1520 high-risk individuals (aged ≥50, >20 pack-year smoking history) underwent annual low-dose helical chest CT for 5 years.
- Non-small cell lung cancers (NSCLC) detected were analyzed for stage at diagnosis.
- Statistical analyses included binomial tests and Poisson regression, comparing results with the Mayo Lung Project.
Main Results:
- 68 lung cancers were diagnosed in 66 participants; 17 of 28 subsequent NSCLC cases (61%) were stage I.
- A significant shift towards earlier stage I NSCLC detection was not observed.
- Lung cancer mortality rates showed no significant difference compared to the Mayo Lung Project.
Conclusions:
- Low-dose chest CT effectively detects lung cancers, including early-stage ones.
- The high rate of benign nodule detection necessitates careful interpretation.
- This study did not demonstrate a significant stage shift or reduction in lung cancer mortality with 5 years of CT screening.