Abstract
Purpose
Latent lymph node metastasis is a clinical concern in the surgical treatment of non-small cell lung cancer (NSCLC). The present study identified a simple tool, including the volume-doubling time (VDT), for evaluating the risk of nodal metastasis.
Methods
We reviewed, retrospectively, 560 patients who underwent radical resection for cN0M0 NSCLC. The whole tumor VDT and solid component VDT (SVDT) for differentiating the histological type and adenocarcinoma subtype were analyzed and a nomogram was constructed using variables selected through a stepwise selection method. The model was assessed through a calibration curve and decision curve analysis (DCA).
Results
Lymph node metastases were detected in 89 patients (15.9%). The SVDT tended to be longer in patients with adenocarcinoma (294.5 days, p < 0.0001) than in those with other histological types of NSCLC, but was shorter when the solid/micropapillary component was predominant (127.0 days, p < 0.0001). The selected variables (tumor location, solid component diameter, consolidation tumor ratio, SVDT, and carcinoembryonic antigen) demonstrated significant differences and were used for the nomogram. The calibration curve indicated consistency, and the DCA showed validity across most threshold ranges from 0 to 68%.
Conclusions
The established nomogram is a useful tool for the preoperative prediction of lymph node metastasis, and the SVDT was the most influential factor in the nomogram.
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595_2023_2695_MOESM1_ESM.pdf
Supplementary file1 (PDF 145 KB) Supplementary Fig. 1. Nomogram to predict pN2 for patients with cN0M0 lung cancer. A nomogram predicting mediastinal lymph node metastasis in the 560 patients was constructed based on tumor markers and imaging findings. SCD solid component diameter, CTR consolidation tumor ratio, SVDT solid component volume doubling time, CEA carcinoembryonic antigen
595_2023_2695_MOESM2_ESM.pdf
Supplementary file2 (PDF 479 KB) Supplementary Fig. 2. Predictive performance of the nomogram for pN2. a ROC curve for the nomogram for the selected variables and each variable. The area under the ROC curve was 0.795 (95% CI 0.741-0.848). b Calibration curve of the nomogram. The solid line is the bias-corrected curve after 1000 bootstrap sampling iterations. c DCA of the nomogram. DCA showed clinical usefulness with a range of 0% to 26% and 31% to 50%. AUC area under the curve, ROC receiver operating characteristic, DCA decision curve analysis
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Karita, R., Suzuki, H., Onozato, Y. et al. A simple nomogram for predicting occult lymph node metastasis of non-small cell lung cancer from preoperative computed tomography findings, including the volume-doubling time. Surg Today 54, 31–40 (2024). https://doi.org/10.1007/s00595-023-02695-9
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DOI: https://doi.org/10.1007/s00595-023-02695-9