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. 2015 Dec 16:15:977.
doi: 10.1186/s12885-015-1964-8.

The impact of the cumulative dose of cisplatin during concurrent chemoradiotherapy on the clinical outcomes of patients with advanced-stage nasopharyngeal carcinoma in an era of intensity-modulated radiotherapy

Affiliations

The impact of the cumulative dose of cisplatin during concurrent chemoradiotherapy on the clinical outcomes of patients with advanced-stage nasopharyngeal carcinoma in an era of intensity-modulated radiotherapy

Shan-Shan Guo et al. BMC Cancer. .

Abstract

Background: The impact of cumulative dose of cisplatin on clinical outcomes of nasopharyngeal carcinoma (NPC) patients who received intensity-modulated radiotherapy (IMRT) was evaluated.

Methods: This study included 491 consecutive patients with histologically confirmed NPC who were treated with concurrent chemoradiotherapy with IMRT. The patients were divided into three groups: low- (cumulative dose≤100 mg/m2), medium- (cumulative dose>100 mg/m2 and ≤200 mg/m2), and high- (cumulative dose>200 mg/m2) dose groups. Subgroups of patients included pre-treatment levels of Epstein-Barr Virus DNA (EBV DNA)<4000 copies/ml and pre-treatment EBV DNA≥4000 copies/ml. To test for independent significance, the Kaplan-Meier with the log-rank test and the Cox proportional hazards model were used.

Results: The 5-year overall survival (OS) rates of the low-, medium-, and high-dose groups were 64.1%, 91.1%, and 89.4%, respectively (P=0.002). Based on multivariate analysis, patients who were in the medium- and high-dose groups had compared with the low-dose group, with an odds ratio of 0.135 (95% CI 0.045-0.405, P<0.001) and 0.225 (95% CI 0.069-0.734, P=0.013), respectively. For the low-risk patients, the cumulative dose of cisplatin significantly associated with a lower OS (P<0.001). The medium-dose group had reduced odds of death compared with the low-dose group, with an odds ratio of 0.062 (95% CI 0.001-0.347, P=0.002), according to multivariate analysis.

Conclusions: The cumulative dose of cisplatin is associated with OS and distant metastasis-free survival (DMFS) among NPC patients who received IMRT.

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Figures

Fig. 1
Fig. 1
Kaplan–Meier curves of overall survival according to the cumulative dose of cisplatin in 491 patients with locally advanced nasopharyngeal carcinoma
Fig. 2
Fig. 2
Kaplan–Meier curves of distant metastasis-free survival according to the cumulative dose of cisplatin in 491 patients with locally advanced nasopharyngeal carcinoma
Fig. 3
Fig. 3
Kaplan–Meier curves of overall survival according to the cumulative dose of cisplatin in 300 low-risk patients with locally advanced nasopharyngeal carcinoma
Fig. 4
Fig. 4
Kaplan–Meier curves of distant metastasis-free survival according to the cumulative dose of cisplatin in 300 low-risk patients with locally advanced nasopharyngeal carcinoma

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