Abstract
Objective
To develop and validate a nomogram to predict distant metastasis-free survival of patients with locoregionally advanced nasopharyngeal carcinoma.
Methods
We collected the total clinical data of 820 nasopharyngeal carcinoma (NPC) patients, of whom 482 formed the training cohort from one hospital and 328 made up the validation cohort from another hospital. By analyzing the prognosis of all patients after intensity-modulated radiotherapy by univariate and multivariate Cox regression models, a nomogram related to DMFS was created in the training cohort. The discriminatory and calibration power of the nomogram was successively assessed in the training and validation cohorts by the C‑index and calibration curve. The predictive ability for 3‑year DMFS was compared between the nomogram and TNM stage using ROC curves. Patients were divided into different risk groups based on scores calculated from the nomogram.
Results
Age, lymph node gross tumor volume (GTVnd), and gross tumor volume of the nasopharynx (GTVnx) were the factors included in the nomogram. The C‑index of the nomogram was 0.721 in the training cohort and 0.750 in the validation cohort. The calibration curves were satisfactory. Patients in the high-risk group were more likely to develop metastases.
Conclusion
A nomogram incorporating age, GTVnd, and GTVnx showed good performance for predicting DMFS in patients with locoregionally advanced NPC.
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Abbreviations
- AUC:
-
Area under the receiver operating characteristic
- DMFS:
-
Distant metastasis-free survival
- GTVnd:
-
Lymph node gross tumor volume
- GTVnx:
-
Gross tumor volume of the nasopharynx
- IMRT:
-
Intensity-modulated radiotherapy
- NPC:
-
Nasopharyngeal carcinoma
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Funding
This work was supported by the National Natural Science Foundation of China (no.: 81760546), the Scientific Research and Technology Development Program of Guilin (no.: 20170109-22), the Natural Science Foundation Key Projects of Guangxi (no.: 2018GXNSFDA050021), the Key Research and Development Program of Guangxi (AB19110016), the General Program of Guangxi Natural Science Foundation of China (no.: 2018GXNSFAA138100), and CSCO Youth Innovative Oncology Research Fund (Y-Young2020-0520).
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Design and scheduling of the research: WJ; collection and sorting of data: RJZ, BZ, and YX; statistical and prognostic analysis of data: HYY, GJQ, and YYM; writing and revising the article: HYY and XLR.
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H. Yang, R. Zhang, R. Zhang, B. Zhang, Y. Xie, G. Qin, Y. Mo, X. Ruan, and W. Jiang declare that they have no competing interests.
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The study was performed following the Declaration of Helsinki. Written informed consent for participation and publication was obtained from participants. The institutional review board of Guilin Medical University approved the study. The ethics approval number was GLMU1A2018062.
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The authors Huiyun Yang, Rongjun Zhang, and Ruyun Zhang contributed equally to the manuscript.
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Yang, H., Zhang, R., Zhang, R. et al. Nomogram for distant metastasis-free survival in patients with locoregionally advanced nasopharyngeal carcinoma. Strahlenther Onkol 198, 828–837 (2022). https://doi.org/10.1007/s00066-022-01926-1
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DOI: https://doi.org/10.1007/s00066-022-01926-1