GP · respiratory-health
Lung cancer suspicion
Also known as Lung nodule · Suspected lung cancer · Pulmonary nodule
GP-fellowship guide to lung cancer suspicion: the presentations that trigger investigation, why a normal CXR does not exclude lung cancer, the NLST and NELSON evidence for low-dose CT screening (20% and 24% mortality reductions), the Brock model for nodule malignancy prediction, nodule follow-up intervals, referral triggers, and the pitfalls of over-watching a malignant nodule.
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Red flags
- A normal CXR does NOT exclude lung cancer — a normal CXR misses up to 20-25% of lung cancers; if clinical suspicion is high, CT is the next step regardless of CXR result
- New haemoptysis in a smoker over 40 is lung cancer until excluded — urgent CXR and CT, not a course of antibiotics
- An incidental pulmonary nodule on a scan done for other reasons is not an incidental finding — it needs size-based follow-up per guidelines
- Unexplained weight loss, finger clubbing, or supraclavicular lymphadenopathy in a smoker is lung cancer until excluded
Overview
Lung cancer is the leading cause of cancer death in Australia. It presents late because early disease is asymptomatic, and the symptoms it does produce (cough, breathlessness) are attributed to smoking. The GP's role is threefold: recognise presentations that warrant investigation, interpret incidental nodules correctly, and identify who qualifies for low-dose CT screening.[1]
References3ShowHide
- [1]Aberle DR, Adams AM, Berg CD, et al. Reduced lung-cancer mortality with low-dose computed tomographic screening N Engl J Med, 2011.PMID 21714641
- [2]de Koning HJ, van der Aalst CM, de Jong PA, et al. Reduced Lung-Cancer Mortality with Volume CT Screening in a Randomized Trial N Engl J Med, 2020.PMID 31995683
- [3]Winter A, Aberle DR, Hsu W External validation and recalibration of the Brock model to predict probability of cancer in pulmonary nodules using NLST data Thorax, 2019.PMID 30898897