Prognostic significance of the total dose of cisplatin administered during concurrent chemoradiotherapy in patients with locoregionally advanced nasopharyngeal carcinoma.
OBJECTIVE
Concurrent chemoradiotherapy (CRT) confers survival benefit over radiotherapy (RT) alone in the treatment of locoregionally advanced nasopharyngeal carcinoma (NPC). This study explored the prognostic significance of the total dose of cisplatin delivered during CRT.


METHODS
A retrospective analysis was performed in patients with stage II to IVB NPC (AJCC 6th edition) who participated in 3 prospective studies. All patients received cisplatin at a fixed dose of 40 mg/m(2)/week during a 6-7-weeks course of CRT. Chi-square test was used in the univariate analysis. Relationship between prognostic factors, the total dose of cisplatin administered and time-to-event endpoints were analyzed with the Cox Hazards model.


RESULTS
Two hundred and forty-one patients were identified with the following stage distribution: Stage II=13.7%, III=45.2%, IV=41.1%. The median total number of cycles of cisplatin administered per patient was 5 cycles (range 1-8 cycles). At a median follow-up of 56.5 months (range 4.2-200.2 months), 93 patients (38.6%) had relapsed and 85 patients (35.2%) died. For all patients, the total number of cycles of cisplatin delivered was significantly associated with survival in the univariate but not the multivariate analysis. In a sub-group analysis of 142 patients with stage II and III NPC, patients who received more than 5 cycles of cisplatin had significantly better overall survival than those who did not (hazard ratio 0.44; 95% confidence interval, 0.23-0.85; p=0.02).


CONCLUSIONS
Number of cycles of cisplatin delivered is an independent prognostic factor in patients with stage II-III NPC undergoing CRT with weekly cisplatin.
Department of Clinical Oncology, Prince of Wales Hospital, Hong Kong, China.
Herbert H
HH
Loong
Brigette B Y
BB
Ma
Sing-Fai
SF
Leung
Frankie
F
Mo
Edwin P
EP
Hui
Michael K
MK
Kam
Stephen L
SL
Chan
Brian K H
BK
Yu
Anthony T C
AT
Chan
D000328:Adult; D000368:Aged; D002277:Carcinoma; D059248:Chemoradiotherapy; D002945:Cisplatin / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D000077274:Nasopharyngeal Carcinoma; D009303:Nasopharyngeal Neoplasms / Q000401:mortality / Q000473:pathology / Q000628:therapy*; D009367:Neoplasm Staging; D011379:Prognosis; D016016:Proportional Hazards Models; D012189:Retrospective Studies
D002945:Cisplatin