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Biomarker identified in relation to drug response in refractory urothelial cancer
Date:3/31/2012

CHICAGO The antiangiogenic drug pazopanib has demonstrated clinically meaningful activity in patients with refractory urothelial cancer, according to results presented at the AACR Annual Meeting 2012, held here March 31 - April 4. The results also revealed that increases in interleukin-8 levels early after treatment with pazopanib may predict a lack of tumor response to the therapy.

"Historically, prognosis of patients with relapsed or refractory urothelial cancer is quite dismal," said Andrea Necchi, M.D., faculty member in the department of medicine at Fondazione IRCCS Istituto Nazionale dei Tumori in Milan, Italy. "Patients who fail to be cured after multiple chemotherapy regimens have a poor survival estimate, and palliative care is a reasonable trade-off."

Data from the phase II proof-of-concept trial identified pazopanib as the first targeted compound to have clinically meaningful activity in patients with refractory urothelial cancer, according to Necchi.

"Our data indicate that pazopanib seems to be a legitimate drug in this disease," said Necchi. "Most interestingly, our biomarker analysis clearly pointed out the role of rising levels of circulating interleukin-8 as an early and potentially practice-changing indicator of tumor resistance and poor survival."

The researchers assigned 41 patients with relapsing or progressing urothelial cancer between 2010 and 2011 to 800 mg once-daily pazopanib. All patients had at least one prior chemotherapy regimen for metastatic disease.

At follow-up, seven patients had a partial response to therapy and 24 patients had stable disease an overall clinical benefit of 76 percent. Median progression-free survival was 2.6 months, and median overall survival was 4.7 months. However, 10 percent of patients had a long-term cure after a median follow-up of 19 months.

The researchers examined blood samples for predictive biomarkers at baseline and every four weeks. The
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Contact: Jeremy Moore
Jeremy.Moore@aacr.org
215-446-7109
American Association for Cancer Research
Source:Eurekalert

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