Lung cancer screening identifies new solid nodules with a 7.4% malignancy rate at 12 monthsNew lung cancer screening data identifies risk for solid nodules

European journal of cancer (Oxford, England : 1990) Published June 20, 2026 Study authors: Jiang Beibei, Lancaster Harriet L, Davies Michael P A, Han Daiwei, Gratama Jan-Willem C, Silva Mario… PubMed ↗ DOI ↗ Editorial oversight: Dr. Julia Lee, PhD · Oncology, Genomics & Drug Development

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Key Takeaway

Note that 30 mm³ is a critical volume threshold; malignancies are more likely in nodules with shorter doubling times.

This multicenter randomized controlled trial assessed the incidence and malignancy risk of new nodules in 875 high-risk individuals (aged 50-75 years, with a LLPv2 risk of ≥4.5%) undergoing lung cancer screening (UKLS). Follow-up CT scans were conducted at 3-month and 12-month intervals.

At the 3-month follow-up, new solid nodules were identified in 17% of participants (72/432), with a malignancy rate of 0% (0/72). At the 12-month follow-up, the incidence of new solid nodules was 8% (68/809), and the overall participant-level malignancy rate for these new nodules was 3.8% (5/131). Specifically, the malignancy rate for new solid nodules at 12 months was 7.4% (5/68).

Risk stratification based on nodule characteristics at 12 months showed varying malignancy probabilities: 0% for nodules < 30 mm³; 7.9% for nodules between 30-200 mm³; and 15.4% for nodules ≥ 200 mm³. Furthermore, malignancy probability increased as volume doubling time (VDT) decreased: 2.0% for VDT ≥ 100 days, 18.8% for VDT 50-100 days, and 33.3% for VDT < 50 days.

Safety data were not reported. A key limitation is the lack of specific reporting on subsolid nodules. These findings suggest that a volume threshold of 30 mm³ and shorter doubling times are critical indicators for clinical suspicion of malignancy in newly detected lung nodules.

How this fits prior evidence

How this fits prior evidence: This study addresses a gap in the practical management of new nodules identified during lung cancer screening. While a narrative review of lung, breast, liver, and kidney cancer evidence provided a broad overview of the field, this trial provides specific quantitative data on malignancy risk based on nodule volume and doubling time to guide surveillance decisions.

When a person is at high risk for lung cancer, every new spot on a scan can cause significant worry. Doctors need to know which ones are harmless and which ones require urgent action. A study of 875 people aged 50 to 75 helped clarify how certain characteristics of these nodules might indicate a higher risk of malignancy.

Researchers looked at new solid nodules found during screenings over a one-year period. They found that the risk of cancer was much higher in nodules that appeared at the 12-month mark compared to those seen at three months. Specifically, they identified a critical size threshold: nodules larger than 30 cubic millimeters had a significantly higher chance of being cancerous.

Growth speed also played a major role in the findings. Nodules that grew quickly—specifically those with a doubling time of less than 50 days—showed a much higher malignancy probability. These results suggest that volume and growth speed are important tools for doctors to decide how closely to monitor new spots.

What this means for you:

Larger solid lung nodules and those that grow rapidly have a higher risk of being cancerous.

Common questions

What makes a lung nodule more likely to be cancerous?

The study found that larger solid nodules are more likely to be cancerous. Specifically, nodules larger than 30 cubic millimeters had a higher risk of malignancy compared to smaller ones. Additionally, the speed at which a nodule grows is important; those with a doubling time of less than 50 days showed a much higher probability of being cancer.

How did the study measure the risk of new lung nodules?

Researchers followed 875 high-risk individuals over a year. They looked at new solid nodules found at 3-month and 12-month follow-ups. They measured the volume of these nodules and their doubling time, which is how long it takes for a nodule to double in size, to determine the likelihood of malignancy.

Is there a difference between short-term and long-term findings?

Yes. The study found that new solid nodules appearing at 12 months had a higher risk of being cancerous than those found at 3 months. At the 3-month mark, no malignancies were found in new subsolid nodules, while the overall malignancy rate for new solid nodules was 3.8%.

Study Details

Study typeRct

Sample sizen = 875

EvidenceLevel 2

Follow-up900.0 mo

PublishedJun 2026

PMID42155364

View Original Abstract ↓

BACKGROUND: New nodules detected during lung cancer screening follow-up have a higher average malignancy risk than same-size baseline nodules. We aimed to characterize the incidence and malignancy risk of new nodules in the UK Lung Cancer Screening Trial (UKLS). METHODS: This study analysed data from the UKLS multicenter randomized controlled trial recruiting 4055 high-risk individuals (aged 50-75 years, with a LLPv2 risk of ≥4.5%) between 2011 and 2013. Our analysis included all non-calcified nodules registered as new at short-term (3-month) or 12-month follow-up. Volume and maximum volume doubling time (VDT) were analysed. Lung cancer diagnoses were confirmed by histology. RESULTS: Of 875 participants with follow-up CT scans, 131 (15%) developed 216 new solid nodules, yielding an overall participant-level malignancy rate of 3.8% (5/131); no malignancies were diagnosed in new subsolid nodules. New solid nodule incidence was 17% (72/432) at short-term and 8% (68/809) at 12-month follow-up. All 5 cancers were first detected at 12-month follow-up, where 7.4% (5/68) of participants with new solid nodules had cancer, while the risk was 0% (0/72) at short-term follow-up. At 12-months, new nodule malignancy probability was stratified by volume: 0% (95% CI: 0.0-21.6) for < 30 mm³ , 7.9% (2.0-21.5) for 30-200 mm³ , and 15.4% (3.1-43.5) for ≥ 200 mm³ ; and by VDT: 2.0% (0.0-11.7) for ≥ 100 days, 18.8% (5.8-43.8) for 50-100 days, and 33.3% (5.6-79.8) for < 50 days. CONCLUSION: New solid nodules at 12-month screening carry higher risk than short-term, and we validate 30mm³ as the critical volume threshold requiring at least further surveillance.

Lung cancer screening identifies new solid nodules with a 7.4% malignancy rate at 12 monthsNew lung cancer screening data identifies risk for solid nodules

How this fits prior evidence

Common questions

Study Details

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Lung cancer screening identifies new solid nodules with a 7.4% malignancy rate at 12 monthsNew lung cancer screening data identifies risk for solid nodules

How this fits prior evidence

Common questions

More on Lung Cancer

Study Details

Transbronchial biopsy with 1.1-mm cryoprobe yields 88.6% diagnosis versus 78.8% with 2.0-mm forceps

Cryoprobe biopsy shows higher success rate for diagnosing lung conditions

Clinical research that matters. Delivered to your inbox.

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