A phase II safety and efficacy study of the vascular endothelial growth factor receptor tyrosine kinase inhibitor pazopanib in patients with metastatic urothelial cancer

Roberto Pili, Rui Qin, P. J. Flynn, Joel Picus, Michael Millward, Wing Ming Ho, Henry Pitot, Winston Tan, Kiersten M. Miles, Charles Erlichman, Ulka Vaishampayan

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

Background Vascular endothelial growth factor (VEGF) is produced by bladder cancer cell lines in vitro and expressed in human bladder tumor tissues. Pazopanib is a vascular endothelial receptor tyrosine kinase inhibitor with anti-angiogenesis and anti-tumor activity in several preclinical models. A 2-stage phase II study was conducted to assess the activity and toxicity profile of pazopanib in patients with metastatic, urothelial carcinoma. Methods Patients with one prior systemic therapy for metastatic urothelial carcinoma were eligible. Patients received pazopanib at a dose of 800 mg orally for a 4-week cycle. Results Nineteen patients were enrolled. No grade 4 or 5 events were experienced. Nine patients experienced 11 grade 3 adverse events. Most common toxicities were anemia, thrombocytopenia, leucopenia, and fatigue. For stage I, none of the first 16 evaluable patients were deemed a success (complete response or partial response) by the Response Evaluation Criteria In Solid Tumors criteria during the first four 4-week cycles of treatment. Median progression-free survival was 1.9 months. This met the futility stopping rule of interim analysis, and therefore the trial was recommended to be permanently closed. Conclusions Pazopanib did not show significant activity in patients with urothelial carcinoma. The role of anti-VEGF therapies in urothelial carcinoma may need further evaluation in rational combination strategies.

Original languageEnglish (US)
Pages (from-to)477-483
Number of pages7
JournalClinical Genitourinary Cancer
Volume11
Issue number4
DOIs
StatePublished - Dec 1 2013

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Keywords

  • Pazopanib
  • Urothelial cancer
  • VEGF tyrosine kinase inhibitors

ASJC Scopus subject areas

  • Oncology
  • Urology

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