Computed tomography screening for lung cancer

Area of Science:

• Pulmonology
• Radiology
• Oncology

Background:

• Lung cancer screening decisions are critical for high-risk individuals and their physicians.
• Low-dose computed tomography (CT) has emerged as a potential screening tool.

Purpose of the Study:

• To review evidence for chest x-ray and low-dose CT lung cancer screening.
• To outline the benefits, harms, and uncertainties of CT screening.
• To summarize current lung cancer screening guidelines.

Main Methods:

• Systematic literature search of MEDLINE and Cochrane Library (1984-2012).
• Inclusion of citations from relevant research and review articles.
• Evidence grading using American Hospital Association guidelines.

Main Results:

• Low-dose CT screening showed a 20% reduction in lung cancer mortality in the National Lung Screening Trial (NLST).
• Other trials had insufficient data or sample sizes for definitive conclusions.
• High false-positive rates in CT screening necessitate follow-up procedures and carry associated risks and costs.

Conclusions:

• High-risk individuals meeting NLST criteria should consider CT screening.
• Shared decision-making with physicians is essential to weigh benefits, harms, and uncertainties.
• Guidelines suggest screening for NLST-eligible individuals, with some expanding recommendations.