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A shallow convolutional neural network predicts prognosis of lung cancer patients in multi-institutional computed tomography image datasets

Abstract

Lung cancer is the most common fatal malignancy in adults worldwide, and non-small-cell lung cancer (NSCLC) accounts for 85% of lung cancer diagnoses. Computed tomography is routinely used in clinical practice to determine lung cancer treatment and assess prognosis. Here, we developed LungNet, a shallow convolutional neural network for predicting outcomes of patients with NSCLC. We trained and evaluated LungNet on four independent cohorts of patients with NSCLC from four medical centres: Stanford Hospital (n = 129), H. Lee Moffitt Cancer Center and Research Institute (n = 185), MAASTRO Clinic (n = 311) and Charité – Universitätsmedizin, Berlin (n = 84). We show that outcomes from LungNet are predictive of overall survival in all four independent survival cohorts as measured by concordance indices of 0.62, 0.62, 0.62 and 0.58 on cohorts 1, 2, 3 and 4, respectively. Furthermore, the survival model can be used, via transfer learning, for classifying benign versus malignant nodules on the Lung Image Database Consortium (n = 1,010), with improved performance (AUC = 0.85) versus training from scratch (AUC = 0.82). LungNet can be used as a non-invasive predictor for prognosis in patients with NSCLC and can facilitate interpretation of computed tomography images for lung cancer stratification and prognostication.

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Fig. 1: Illustration of LungNet’s CNN architecture.
Fig. 2: Illustration of the proposed computational framework.
Fig. 3: Kaplan–Meier analysis of LungNet.
Fig. 4: Kaplan–Meier survival performance of LungNet on early-stage cancers.
Fig. 5: Transfer learning for malignancy prediction.
Fig. 6: Visualization of lung nodules and their survival outcomes in 2D space using t-SNE.

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Data availability

The data for cohort 1 (Stanford Hospital, n = 129) are publicly available on The Cancer Imaging Archive (TCIA) at https://doi.org/10.7937/K9/TCIA.2017.7hs46erv (ref. 64). A portion of the data (54/185) for cohort 2 (H. Lee Moffitt Cancer Center and Research Institute, n = 185) is available from TCIA at https://doi.org/10.7937/K9/TCIA.2015.NPGZYZBZ (ref. 65) and https://doi.org/10.7937/K9/TCIA.2015.A6V7JIWX (ref. 66). The data for cohort 3 (MAASTRO Clinic, the Netherlands, n = 311) are publicly available on TCIA at https://doi.org/10.7937/K9/TCIA.2015.PF0M9REI (ref. 11). The data for cohort 4 (Charité – Universitätsmedizin, Berlin, n = 84) are not publicly available yet. The data for LIDC–IDRI (n = 1,010) are available on TCIA at https://doi.org/10.7937/K9/TCIA.2015.LO9QL9SX (ref. 67).

Code availability

Code for LungNet is available at https://doi.org/10.24433/CO.0612256.v1 (ref. 68).

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Acknowledgements

Research reported in this publication was supported by the National Institute of Biomedical Imaging and Bioengineering (NIBIB) of the National Institutes of Health under award number R01EB020527 and R56EB020527. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. A Titan X Pascal used for this research was donated by the NVIDIA Corporation.

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Conception design: M.Z., E.L. and O.G. Provision of data: O.G., Y.B., S.N. and R.G. Data analysis and interpretation: P.M., M.Z., E.L. and O.G. Writing: all authors. Computation resource: O.G.

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Correspondence to Olivier Gevaert.

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Supplementary information on the features extracted for radiomic analysis.

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Mukherjee, P., Zhou, M., Lee, E. et al. A shallow convolutional neural network predicts prognosis of lung cancer patients in multi-institutional computed tomography image datasets. Nat Mach Intell 2, 274–282 (2020). https://doi.org/10.1038/s42256-020-0173-6

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