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- W1998757588 abstract "Sunitinib has activity in patients with metastatic urothelial cancer (UC), but most patients do not respond. To identify predictors of response to sunitinib. Seventy-seven patients with advanced UC received sunitinib on one of two schedules at a single institution. Blood pressure (BP), immunohistochemistry (IHC), and pharmacokinetic (PK) results were correlated with response to sunitinib. BP was assessed on day 1 and 28 of each cycle and on day 14 of cycle 1. IHC was performed on 55 samples from 38 cases using mammalian target of rapamycin and hypoxia-inducible factor (HIF) pathway marker antibodies. Blood samples for PK analysis were collected from 15 patients at three time points. Response was assessed using Response Evaluation Criteria in Solid Tumors criteria. Sunitinib-induced hypertension predicted improved response when hypertension was categorized as a discrete (p = 0.02) or continuous variable (p = 0.005 [systolic BP] and p = 0.007 [diastolic BP]). The odds ratio of response was 12.5 (95% confidence interval, 1.95–246.8) for grade 3/4 hypertension compared with grade 0. Response was associated with low HIF-1α expression in primary (p = 0.07) tissue. A nonstatistically significant trend was seen for an association between greater drug concentration and best response. A correlation between expression markers within the same pathways was identified, phosphorylated-4EBP1 and phosphorylated-S6 (p = 6.5 × 10−9), and vascular endothelial growth factor receptor 2 and HIF-1α (p = 0.008). Results are limited by small numbers. Clinical and molecular biomarkers of response to sunitinib may have clinical relevance and require prospective validation. There is an urgent need for predictive biomarkers to guide the management of UC." @default.
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- W1998757588 date "2011-08-01" @default.
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- W1998757588 title "Sunitinib in Urothelial Cancer: Clinical, Pharmacokinetic, and Immunohistochemical Study of Predictors of Response" @default.
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- W1998757588 doi "https://doi.org/10.1016/j.eururo.2011.05.034" @default.
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