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Before lung cancer becomes invasive, a family of immune-dampening cells (effector regulatory T cells) builds up in the precancerous airway lining and in the blood, and rising levels marked people whose early cancers grew fast. In mice, blocking the PI3K-delta signal these cells depend on reduced lung tumours.
A study led from the UCL Cancer Institute, University College London, of how the T cell network changes as non-small-cell lung cancer develops, in patients with preinvasive lung lesions followed by autofluorescence bronchoscopy and CT imaging. The team profiled immune cells across tissues and blood with several molecular methods.
Effector regulatory CD4 T cells expressing the transcription factor BATF accumulated in high-grade premalignant airway lesions and were clonally related to effector regulatory T cells circulating in the blood. Circulating levels rose as preinvasive lesions progressed, so the process could be followed with a blood sample, and the emergence of this clonally coordinated circuit defined rapid progression in patients whose early-stage cancer was found by CT screening.
In mice, carcinogen-driven lung tumour formation set up a matching preinvasive regulatory T cell axis across blood, airways and draining lymph nodes, ending in an expansion of BATF-positive regulatory T cells in the lung and in immature tertiary lymphoid structures around the airways rich in them. Inhibiting PI3K-delta prevented those structures forming, lowered regulatory T cells in blood and lung, raised local conventional type 1 dendritic cells (cDC1s) and reduced lung tumour incidence and size. The authors propose the network as a way both to track and to target preinvasive immune regulation for lung cancer interception.
Late-stage lung cancer is rarely curable, so the authors look for ways to act before a cancer becomes invasive. This paper points to two things that could move the fight earlier. First, a blood signal: immune cells that suppress the response to the tumour rise as precancerous airway lesions progress, which could one day help decide which screen-detected nodules or lesions need treatment now. Second, a target: in mice, blocking the PI3K-delta signal these cells use prevented the immune changes and reduced tumours. Neither is a test or a treatment yet; both need trials in people at high risk.
Shares University College London Hospitals / UCL Cancer Institute, Low-dose CT lung screening, Lung cancer (all types), Non-small-cell lung cancer.
Shares University College London Hospitals / UCL Cancer Institute, Low-dose CT lung screening, Lung cancer (all types), Non-small-cell lung cancer.
Shares Bronchoscopy (EBUS, robotic navigation), Lung cancer (all types), Non-small-cell lung cancer.
Shares Low-dose CT lung screening, Lung cancer (all types), Non-small-cell lung cancer.
Shares University College London Hospitals / UCL Cancer Institute, Low-dose CT lung screening.
Shares Nature, Cold tumours and the immunosuppressive microenvironment, Lung cancer (all types), Non-small-cell lung cancer.
Shares Low-dose CT lung screening, Lung cancer (all types), Non-small-cell lung cancer.
Shares Bronchoscopy (EBUS, robotic navigation), Lung cancer (all types), Non-small-cell lung cancer.
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