Guideline Recommendations for Lung Cancer Screening in High‑Risk Adults

Eligibility Criteria

Adults aged 50–80 years with a ≥20 pack‑year smoking history, who are currently smoking or have quit within the past 15 years, and who are fit for curative‑intent lung surgery are recommended for annual low‑dose CT screening [@1].
Individuals ≥50 years with ≥20 pack‑years plus one additional high‑risk factor (e.g., prior cancer, chronic lung disease, first‑degree relative with lung cancer, occupational carcinogen exposure, or radon exposure) also qualify for screening [@1].
Restricting screening to age 55 with ≥30 pack‑years would capture only ≈27 % of patients who are later diagnosed with lung cancer, underscoring the broader eligibility criteria [@1].

Age < 50 years or > 80 years disqualifies individuals from screening [@5].
A smoking history <20 pack‑years without any additional risk factor is insufficient for screening [@5].
Persons who quit smoking >15 years ago are excluded, regardless of pack‑year exposure [@1].
Patients with medical conditions that preclude curative lung surgery, limited life expectancy, or unwillingness to undergo curative surgery should not be screened [@1].

Annual low‑dose CT (LDCT) without IV contrast is the only validated screening test for lung cancer [@5].
Chest radiography (X‑ray) does not reduce lung‑cancer mortality and must not be used for screening; large trials (PLCO, Mayo Lung Project) showed no mortality benefit [@5].
Other modalities (sputum cytology, FDG‑PET/CT, MRI chest, standard‑dose CT) are not recommended for screening [@5].

Screening must be performed at high‑quality centers with a multidisciplinary team that includes thoracic radiology, pulmonary medicine, and thoracic surgery [@1].
Centers must have expertise in LDCT interpretation and lung‑nodule management and provide comprehensive diagnostic and treatment services [@1].

All positive LDCT findings require multidisciplinary evaluation using established protocols (e.g., Lung‑RADS) [@1].
Screening should be discontinued when any of the following occur:

Vigorous smoking‑cessation counseling is identified as the single most effective intervention to reduce lung‑cancer risk and must be offered to all screened patients [@1].

Category 1 (strongest evidence): Age 55–74 years with ≥30 pack‑years, currently smoking or quit ≤15 years [@1].
Category 2A (moderate evidence): Age ≥50 years with ≥20 pack‑years plus one additional risk factor [@1].
The 2025 NCCN update removed the 15‑year quit‑date cutoff, noting that lung‑cancer risk rises by ≈8.7 % per year beyond 15 years of cessation, supporting expanded eligibility [@1].
The 2021 USPSTF expansion (age 50–80, ≥20 pack‑years) increased the eligible population to ≈19.2 million and reduced sex/race disparities [@1].
The NCCN emphasizes no upper age limit; eligibility should be based on fitness for curative treatment, not chronological age [@1].

Do NOT screen individuals < 50 years regardless of smoking history [@5].
Do NOT screen individuals > 80 years regardless of pack‑year exposure [@5].
Do NOT screen persons with < 20 pack‑years without an additional risk factor [@5].
Do NOT screen former smokers who quit >15 years ago, even if they have a high pack‑year history [@1].
Never use chest X‑ray for screening; it is proven ineffective [@5].