A phase II trial of second-line pemetrexed in adults with advanced/metastatic osteosarcoma

Background: Osteosarcoma is the most common primary malignant tumour in young adults. An effective treatment strategy for relapsed patients is still not defined. Pemetrexed is a multitargeted antifolate with a mode of action similar to, and a range of action broader than that of methotrexate. The pr...

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Main Authors: Duffaud, Florence (Author) , Egerer, Gerlinde (Author)
Format: Article (Journal)
Language:English
Published: 12 January 2012
In: European journal of cancer
Year: 2012, Volume: 48, Issue: 4, Pages: 564-570
ISSN:1879-0852
DOI:10.1016/j.ejca.2011.12.015
Online Access:Verlag, Volltext: http://dx.doi.org/10.1016/j.ejca.2011.12.015
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0959804911010409
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Author Notes:Florence Duffaud, Gerlinde Egerer, Stefano Ferrari, Hisham Rassam, Ulrike Boecker, B. Bui-Nguyen

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520 |a Background: Osteosarcoma is the most common primary malignant tumour in young adults. An effective treatment strategy for relapsed patients is still not defined. Pemetrexed is a multitargeted antifolate with a mode of action similar to, and a range of action broader than that of methotrexate. The primary objective of this phase II study was to determine tumour response rate in patients with high-grade, advanced/metastatic osteosarcoma. Secondary end-points included progression-free survival (PFS), overall survival (OS) and safety. Methods: Pemetrexed 500mg/m2 was administered on day 1 of 21-day cycles with folic acid and vitamin B12 supplementation. At least 5 tumour responses in a targeted population of 32 were required to consider further investigation. Results: Thirty-two patients (median age, 43.3years; range, 18.6-76.0) with 1 prior chemotherapy regimen for high-grade advanced/metastatic osteosarcoma were enrolled. Thirty (93.8%) patients had an ECOG performance status ⩽1 and 29 (90.6%) had metastases in the lung. One patient had partial response (3.1%) and 5 (15.6%) had stable disease. Median PFS and OS were 1.4months (95% CI: 1.4-1.7) and 5.5months (95% CI: 2.3-10.5), respectively. The most common drug-related grade 3/4 toxicities were leukopaenia, asthaenia and elevated alanine aminotransferase in 3 (9.4%) patients each. One patient died due to multi-organ failure considered possibly related to the study drug. Conclusions: Pemetrexed 500mg/m2 administered on day 1 of 21-day cycles as second-line treatment to patients with advanced/metastatic high-grade osteosarcoma was generally well tolerated but did not meet minimal response expectations for further investigation in this patient population. 
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