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Tumor blood flow is an important determinant of the efficacy of presently available antineoplastic treatment modalities. Using 113Sn-labeled microspheres, 25 micron in diameter, we measured blood flow to primary tumors and regional lymph node metastases in conscious SMT-2A mammary adenocarcinoma-bearing syngeneic rats following a single i.v. bolus injection of the calcium entry blocker, flunarizine. Tumor blood flow increased in a biphasic dose-dependent fashion; at a dose of 1 mg/kg, primarypmid:6692410 fatcat:nwncjwdtafdwrpy24fz5sogz34