Development and External Validation of Nomograms for Predicting Survival in Nasopharyngeal Carcinoma Patients after Definitive Radiotherapy.
The distant metastasis free survival (DMFS) and overall survival (OS) differ significantly among individuals even within the same clinical stages. The purpose of this retrospective study was to build nomograms incorporating plasma EBV DNA for predicting DMFS and OS of nasopharyngeal carcinoma (NPC) patients after definitive radiotherapy. A total of 1168 non-metastatic NPC patients from two institutions were included to develop the nomograms. Seven and six independent prognostic factors were identified to build the nomograms for OS and DMFS, respectively. The models were externally validated by a separate cohort of 756 NPC patients from the third institutions. For predicting OS, the c-index of the nomogram was significantly better than that of the TNM staging system (Training cohort, P = 0.005; validation cohort, P = 0.03). The c-index of nomogram for DMFS in the training and validation set were both higher than that of TNM classification with marginal significance (P = 0.048 and P = 0.057, respectively). The probability of 1-, 3-, and 5-year OS and DMFS showed optimal agreement between nomogram prediction and actual observation. The proposed stratification of risk groups based on the nomograms allowed significant distinction between Kaplan-Meier curves for survival outcomes. The prognostic nomograms could better stratify patients into different risk groups.
Sun Yat-sen University cancer center, 651 Dongfeng Road east, Guangzhou, China.|State Key Laboratory of Oncology in Southern China, Guangzhou, China.|Collaborative Innovation Center for Cancer Medicine, Guangzhou, China.
Lin
L
Yang
Sun Yat-sen University cancer center, 651 Dongfeng Road east, Guangzhou, China.|State Key Laboratory of Oncology in Southern China, Guangzhou, China.|Collaborative Innovation Center for Cancer Medicine, Guangzhou, China.
Shaodong
S
Hong
Sun Yat-sen University cancer center, 651 Dongfeng Road east, Guangzhou, China.|State Key Laboratory of Oncology in Southern China, Guangzhou, China.|Collaborative Innovation Center for Cancer Medicine, Guangzhou, China.
Yan
Y
Wang
The Six Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
Haiyang
H
Chen
The First Hospital of Foshan, Foshan, China.
Shaobo
S
Liang
The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China.
Peijian
P
Peng
Sun Yat-sen University cancer center, 651 Dongfeng Road east, Guangzhou, China.|State Key Laboratory of Oncology in Southern China, Guangzhou, China.|Collaborative Innovation Center for Cancer Medicine, Guangzhou, China.
Yong
Y
Chen
D000465:Algorithms; D002277:Carcinoma; D004279:DNA, Viral / Q000097:blood*; D018572:Disease-Free Survival; D005260:Female; D004854:Herpesvirus 4, Human / Q000235:genetics*; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D000077274:Nasopharyngeal Carcinoma; D009303:Nasopharyngeal Neoplasms / Q000401:mortality* / Q000532:radiotherapy*; D049451:Nomograms; D012189:Retrospective Studies; D015996:Survival Rate
D004279:DNA, Viral