Low-dose CT screening can reduce cancer mortality: A meta-analysis

Area of Science:

• Pulmonology
• Oncology
• Radiology

Background:

• Lung cancer remains a leading cause of cancer mortality.
• Early detection is crucial for reducing lung cancer deaths.
• Low-dose CT (LDCT) screening is a potential tool for early detection.

Purpose of the Study:

• To evaluate the effectiveness of LDCT screening in reducing lung cancer mortality.
• To determine the optimal screening program for lung cancer.
• To analyze findings from randomized controlled trials (RCTs) on LDCT screening.

Main Methods:

• A meta-analysis of nine RCTs was conducted.
• Studies included smokers aged over 49 years with a significant smoking history.
• Searches were performed across major scientific databases (PubMed, Web of Science, Cochrane, ScienceDirect, Chinese databases).

Main Results:

• LDCT screening identified more lung cancer cases (RR=1.58) and early-stage (Stage I) lung cancers (RR=3.45) compared to chest X-ray or no screening.
• A statistically significant reduction in lung cancer-specific mortality was observed (RR=0.84).
• No significant reduction in all-cause mortality was found (RR=1.26).

Conclusions:

• LDCT screening is effective in increasing lung cancer detection rates and decreasing lung cancer-specific mortality.
• Annual LDCT screening may be more beneficial than biennial screening for detecting early-stage lung cancers.
• LDCT screening is a valuable tool for high-risk populations.