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Lung Cancer Screening With Low-Dose Computed Tomography.

Martin Reck¹, Sabine Dettmer, Hans-Ulrich Kauczor

¹Lung Clinic Grosshansdorf, Airway Research Center North (ARCN), German Center for Lung Research (DZL); Institute for Diagnostic and Interventional Radiology, Hanover Medical School, Biomedical Research in Endstage and Obstructive Lung Disease Hanover (BREATH), German Center for Lung Research (DZL); Institute for Diagnostic and Interventional Radiology, Heidelberg University Hospital, Translational Lung Research Center (TLRC), German Center for Lung Research (DZL); German Cancer Research Center (DKFZ), Heidelberg, Translational Lung Research Center (TLRC), German Center for Lung Research (DZL); Department for Thoracic Oncology, Asklepios Specialist Clinics Munich-Gauting, German Center for Lung Research (DZL).

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Summary

Low-dose computed tomography screening significantly reduces lung cancer mortality in heavy smokers. However, potential harms from false positives and overdiagnosis must be carefully considered alongside this benefit.

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Area of Science:

Oncology
Radiology
Public Health

Background:

Lung cancer poses a significant mortality risk, with most cases diagnosed at advanced stages (III or IV) when curative treatment is less effective.
Early-stage lung cancer (I or II) offers better treatment outcomes, but is often asymptomatic, leading to delayed diagnosis.
Lung cancer screening aims to detect the disease at earlier, more treatable stages.

Approach:

This review synthesizes findings from pertinent literature on lung cancer screening methodologies.
Analysis includes data on sensitivity, specificity, and mortality reduction from relevant studies.
A meta-analysis by the German Federal Office for Radiation Protection was specifically examined.

Key Points:

Published lung cancer screening studies show high sensitivity (68.5%–93.8%) and specificity (73.4%–99.2%).
Low-dose computed tomography (CT) screening demonstrated a 15% reduction in lung cancer mortality among high-risk individuals.
The screening arm had a slightly lower mortality rate (1.9%) compared to the control group (2.2%) over 6.6–10 years.
False-positive rates in screening were substantial (84.9%–96.4%), with 45%–70% of biopsies/procedures confirming malignancy.

Conclusions:

Systematic lung cancer screening using low-dose CT is effective in reducing mortality for current or former heavy smokers.
The benefits of reduced lung cancer mortality must be balanced against the risks of false-positive results and overdiagnosis.
Careful patient selection and risk-benefit assessment are crucial for effective lung cancer screening programs.