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Radiother Oncol. 2012 Sep;104(3):294-9. doi: 10.1016/j.radonc.2012.09.001. Epub 2012 Sep 19.

Is primary tumor volume still a prognostic factor in intensity modulated radiation therapy for nasopharyngeal carcinoma?

Author information

1
Sun Yat-sen University Cancer Center, Guangzhou, People's Republic of China.

Abstract

BACKGROUND AND PURPOSE:

To evaluate the prognostic value of gross primary tumor volume (GTV-P) in nasopharyngeal carcinoma (NPC) patients treated with intensity modulated radiotherapy (IMRT).

METHODS AND MATERIALS:

A total of 694 nonmetastatic and histologically proven NPC patients who underwent IMRT were retrospectively reviewed. Samples were split randomly into a training set (n=232) and a test set (n=462) to analysis. The receiver operating characteristic (ROC) curves were calculated to identify the cut-off point and test the prognostic validity of the GTV-P. The correlations between GTV-P and the American Joint Committee on Cancer (AJCC) disease stages were also analyzed.

RESULTS:

The 5-year disease-free survival (DFS), overall survival (OS), local relapse-free survival (LRFS) and distant metastasis-free survival (DMFS) rates for NPC patients with GTV-P<19 vs. ≥19 ml were 94.9% vs. 64.8%, 97.0% vs. 76.4%, 98.2% vs. 92.5% and 97.1% vs. 75.2%, respectively (all P<0.05) in all patients. Multivariate analysis indicated GTV-P was an independent prognostic factor. The ROC curve verified that the predictive ability of T classifications was improved when combined with GTV-P (P<0.001).

CONCLUSIONS:

GTV-P is an independent prognostic indicator for treatment outcome after IMRT, and significantly improves the prognostic validity of T classifications in NPC.

PMID:
22998947
DOI:
10.1016/j.radonc.2012.09.001
[Indexed for MEDLINE]

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