A drug that is already clinically available for the treatment of nausea and psychosis, called prochlorperazine (PCZ), inhibits the internalization of receptors on the surface of tumor cells, thereby increasing the ability of anticancer antibodies to bind to the receptors and mount more effective immune responses. PCZ enhanced the ability of anticancer antibodies to reduce tumor growth in mice, by temporarily increasing the clustering of a receptor targeted by anticancer antibodies on the surface of tumor cells. Temporary treatment of cancer patients with PCZ similarly resulted in receptor clustering on tumor cells inside of patients. The work appears March 5 in the journal Cell.
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