Lung Cancer Screening with Low-Dose CT: a Meta-Analysis

Area of Science:

• Pulmonology
• Oncology
• Radiology

Background:

• Randomized controlled trials have investigated the effectiveness of low-dose CT (LDCT) screening for lung cancer (LC).
• Assessing the impact of LDCT screening on LC outcomes is crucial for public health strategies.

Purpose of the Study:

• To conduct a meta-analysis of LDCT lung cancer screening trials.
• To evaluate the efficacy of LDCT screening on lung cancer mortality and other outcomes.

Main Methods:

• Searched multiple databases including PubMed, Google Scholar, and ClinicalTrials.gov.
• Extracted data on study design, stage I LC diagnoses, mortality, false positives, harms, overdiagnosis, and incidental findings.
• Assessed study quality and used random-effects models for meta-analysis.

Main Results:

• Analyzed 9 studies with 96,559 participants; risk of bias was low.
• LDCT screening increased stage I LC detection (RR = 2.93) and reduced LC mortality (RR = 0.84).
• No significant reduction in overall mortality; false positives (8%), overdiagnosis (8.9%), and incidental findings (7.5%) were low.

Conclusions:

• LDCT screening effectively reduces lung cancer mortality, with potential for greater benefit in women.
• The risks associated with LDCT screening, including false positives and complications, are minimal.
• Generalizability may be limited due to reliance on North American and European data for long-term survival.