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Annals of Oncology Advance Access published online on April 11, 2005
Annals of Oncology, doi:10.1093/annonc/mdi187
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© 2005 European Society for Medical Oncology
Received May 21, 2004
Revised January 10, 2005
Accepted January 14, 2005

Original article

Second-line (post-study) chemotherapy received by patients treated in the phase III trial of pemetrexed plus cisplatin versus cisplatin alone in malignant pleural mesothelioma

C. Manegold 1*, J. Symanowski 2, U. Gatzemeier 3, M. Reck 3, J. von Pawel 4, C. Kortsik 5, K. Nackaerts 6, P. Lianes 7, and N. J. Vogelzang 8

1 Heidelberg University Medical Center, Mannheim, Germany
2 Eli Lilly and Company, Indianapolis, IN, USA
3 Hospital Grosshansdorf, Grosshansdorf, Germany
4 Asklepios-Fachklinik, Munchen-Gauting, Germany
5 St Hildegardis-Krankenhaus, Mainz, Germany
6 University Hospital Gasthuisberg, Leuven, Belgium
7 Hospital de Mataro, Barcelona, Spain
8 Nevada Cancer Institute, Las Vegas, NV, USA

* To whom correspondence should be addressed.
C. Manegold, E-mail: Prof.Manegold{at}t-online.de


  Abstract

Background: A phase III trial in patients with malignant pleural mesothelioma demonstrated a survival advantage for pemetrexed plus cisplatin compared with single-agent cisplatin. Because post-study chemotherapy (PSC) may have influenced the outcome of the trial, we examined its use and association with survival.

Patients and methods: Eighty-four patients from the pemetrexed plus cisplatin arm and 105 patients from the single-agent cisplatin arm received PSC. Kaplan-Meier survival estimates were compared by treatment groups, and by PSC and non-PSC subgroups.

Results: The percentage of patients receiving PSC was imbalanced between the treatment arms. Fewer pemetrexed plus cisplatin treated patients received PSC (37.2% versus 47.3%). A multiple regression analysis performed in this trial showed that PSC had a statistically significant correlation with prolonged survival (P <0.01), adjusting for baseline prognostic factors and treatment intervention. The adjusted hazard ratio for PSC over non-PSC subgroups was 0.56 (confidence interval 0.44-0.72).

Conclusions: PSC in malignant pleural mesothelioma was significantly associated with prolonged survival. It is not known whether the reduced risk of death was associated with PSC or whether patients who had prolonged survival tended to receive more PSC. The pemetrexed plus cisplatin treatment group had a statistically significant survival advantage even though fewer patients from that arm of the trial received PSC. The potentially beneficial role of PSC should be assessed in prospective trials.

Keywords: malignant pleural mesothelioma; pemetrexed; second-line chemotherapy.
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