Pazopanib, a Multikinase Angiogenesis Inhibitor, in Patients With Relapsed or Refractory Advanced Soft Tissue Sarcoma: A Phase II Study From the European Organisation for Research and Treatment of Cancer–Soft Tissue and Bone Sarcoma Group (EORTC Study 62043)

• Published in: Journal of clinical oncology Vol. 27; no. 19; pp. 3126 - 3132
• Main Authors: SLEIJFER, Stefan, RAY-COQUARD, Isabelle, VAN GLABBEKE, Martine, VERWEIJ, Jaap, BLAY, Jean-Yves, PAPAI, Zsuzsa, LE CESNE, Axel, SCURR, Michelle, SCHÖFFSKI, Patrick, COLLIN, Françoise, PANDITE, Lini, MARREAUD, Sandrine, DE BRAUWER, Annick
• Format: Journal Article
• Language: English
• Published: Alexandria, VA American Society of Clinical Oncology 01.07.2009
• Subjects: Adult; Aged; Angiogenesis Inhibitors - therapeutic use; Biological and medical sciences; Dermatology; Disease-Free Survival; Female; Humans; Male; Medical sciences; Middle Aged; Neoplasm Recurrence, Local - drug therapy; Neoplasm Recurrence, Local - mortality; Pyrimidines - therapeutic use; Sarcoma - drug therapy; Sarcoma - mortality; Soft Tissue Neoplasms - drug therapy; Soft Tissue Neoplasms - mortality; Sulfonamides - therapeutic use; Tumors; Tumors of the skin and soft tissue. Premalignant lesions; Europe; Human; Relapse; Treatment resistance; Enzyme; Tyrosine kinase inhibitor; Transferases; Diseases of the osteoarticular system; Soft tissue sarcoma; Malignant tumor; Research; Bone cancer; Cancerology; Treatment; Phase II trial; Advanced stage; Antiangiogenic agent; Protein-tyrosine kinase; Pazopanib; Cancer; European Organization for Research and Treatment of Cancer
• ISSN: 0732-183X; 1527-7755
• DOI: 10.1200/JCO.2008.21.3223

PURPOSE Given the importance of angiogenesis in soft tissue sarcoma (STS), pazopanib, an oral angiogenesis inhibitor that targets vascular endothelial growth factor receptor and platelet-derived growth factor receptor, was explored in patients with advanced STS. PATIENTS AND METHODS Patients with intermediate- or high-grade advanced STS who were ineligible for chemotherapy or who had received no more than two prior cytotoxic agents for advanced disease, who had documented progression, who had adequate performance status, and who had good organ function were eligible. Pazopanib 800 mg was given daily. The primary end point was progression-free rate at 12 weeks (PFR(12 weeks)). Secondary end points were response, safety, and overall survival. Four different strata were studied: adipocytic STS, leiomyosarcomas, synovial sarcomas, and other STS types. A Simon two-stage design was applied (P1 = 40%; P0 = 20%; alpha = beta = .1) for each stratum. Results One hundred forty-two patients were enrolled. The adipocytic STS stratum was closed after the first stage, given insufficient activity (PFR(12 weeks), five [26%] of19). PFR(12 weeks) was 18 (44%) of 41 patients in the leiomyosarcoma cohort, 18 (49%) of 37 in the synovial sarcomas, and 16 (39%) of 41 in the other STS types. Compared with historical controls who were treated with second-line chemotherapy, progression-free and overall survivals were prolonged in the three cohorts in which the primary end point was reached. The most frequent drug-related toxicities were hypertension, fatigue, hypopigmentation, and nausea. Other toxicities included liver enzyme elevations, myelosuppression, and proteinuria, all of which were mostly grades 1 to 2. The most frequent grades 3 to 4 toxicities were hyperbilirubinemia (6.3%), hypertension (7.7%), and fatigue (7.7%). CONCLUSION Pazopanib is well tolerated in patients with relapsed, advanced STS and demonstrates interesting activity that warrants additional study in patients with leiomyosarcomas, synovial sarcomas, and other STS types.