A potent and selective inhibitor of the mitotic kinesin CENP-E (GSK923295A) demonstrates a novel mechanism of inhibiting tumor cell proliferation and shows activity against a broad panel of human tumor cell lines in vitro: Abstract A 111.A first-in-class, targeted investigational therapy specifically designed to inhibit a single protein that functions only during cell division shows potent activity in a broad range of cancer cell lines, say researchers from GlaxoSmithKline. Because the compound is so specifically targeted, it may help reduce some of the more common toxic side effects of chemotherapy, they say.