[Significance of dual-time-point 18F-FDG PET imaging in evaluation of hilar and mediastinal lymph node metastasis in non-small-cell lung cancer].
OBJECTIVE
To explore the diagnostic value of dual-time-point 18F-FDG PET-CT imaging in detecting hilar and mediastinal lymph node metastasis in non-small-cell lung cancer (NSCLC).


METHODS
Forty-six patients with NSCLC underwent standard whole body single-time 18F-FDG PET-CT scans and a delayed imaging for the thorax alone before surgery, meanwhile, the standard uptake value (SUV) and retention index (RI) were calculated.


RESULTS
A total number of 584 lymph nodes were excised in the 46 patients. Of these, 134 metastatic lymph nodes were pathologically confirmed in 31 patients. There were 189 lymph nodes detected and suspected to be metastatic by standard single-time 18 F-FDG PET-CT imaging, and 161 by dual-time-point imaging. Therefore, the sensitivity, specificity, diagnostic accuracy, positive predictive value and negative predictive value in the detection of hilar and mediastinal lymph node metastasis were 87.3%, 84.0%, 84.8%, 61.9% and 95.7% by standard single-time 18F-FDG PET-CT imaging, versus 94.8%, 92.2%, 92.8%, 78.9% and 98.1%, respectively, by dual-time-point imaging. There was a statistically significant difference in the detection of lymph node metastasis between the standard single-time imaging and dual-time-point 18F-FDG PET-CT imaging.


CONCLUSIONS
Dual-time-point 18F-FDG PET-CT imaging is more sensitive, specific and accurate than standard single-time 18F-FDG PET-CT imaging in the detection of hilar and mediastinal lymph node metastasis, and may provide more information for diagnosis, staging and treatment of non-small cell lung cancer.
Hu
Man
M
Department of Radiation Oncology, Shandong Cancer Hospital, Jinan 250117, China.
Yu
Jin-Ming
JM
Liu
Ning-Bo
NB
Liu
Lan-Ping
LP
Guo
Hong-Bo
HB
Yang
Guo-Ren
GR
Zhang
Pin-Liang
PL
Xu
Xiao-Qing
XQ
D000328:Adult; D000368:Aged; D002289:Carcinoma, Non-Small-Cell Lung / Q000000981:diagnostic imaging* / Q000473:pathology; D005188:False Negative Reactions; D005189:False Positive Reactions; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D008198:Lymph Nodes / Q000000981:diagnostic imaging* / Q000473:pathology; D008207:Lymphatic Metastasis / Q000000981:diagnostic imaging*; D008297:Male; D008482:Mediastinum / Q000473:pathology; D008875:Middle Aged; D049268:Positron-Emission Tomography / Q000379:methods*; D012680:Sensitivity and Specificity; D013997:Time Factors
D019788:Fluorodeoxyglucose F18