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Background. Sunitinib is a multitargeted tyrosine kinase inhibitor used in the treatment of metastatic renal cell carcinoma (RCC) and gastrointestinal stromal tumor (GIST), and undergoing evaluation for other malignancy. Hypertension is one of its major side effects with a substantial variation in the reported incidences among clinical studies. We here performed a systematic review and meta-analysis of published clinical trials to determine its overall risk. Methods. Relevant studies were searched and identified in MEDLINE (OVID 1966 to July, 2007), Web of Science, and abstracts presented at the American Society of Clinical Oncology annual meetings from 2004 through 2007. Eligible studies were prospective clinical trials that had described events of hypertension for patients who received single agent sunitinib. The incidence of hypertension and relative risk (RR) were calculated using the random-effects or the …