EurekAlert -- Tumor cells in a particular subset of breast cancer patients churn out too much of a protein called ErbB2 -- also often called HER2 -- which drives the cells to proliferate unchecked. Patients unlucky enough to be in this group -- about one in four -- have poorer prognoses and clinical outcomes than those who don’t. The drugs Herceptin and Lapatinib, prescribed in combination with other chemotherapeutic agents, have improved this picture significantly, but leave plenty of room for improvement: they suppress ErbB2 but are effective against less than half of ErbB2-producing tumors. Moreover, patients with tumors that do respond usually develop resistance to these drugs. A team of scientists at Cold Spring Harbor Laboratory has just published research identifying an enzyme called Brk that may serve as a target for future drugs developed to fight ErbB2-positive tumors. Brk, they report, helps these tumors become virulent and is also implicated in the process through which the tumors develop drug resistance.
