Tykerb and Herceptin developed by GlaxoSmithKline, are targeted therapies aimed at cancers that are HER2-positive, which means they make too much of the HER2/neu protein. While the Herceptin blocks the protein on the cancer cell's surface, Tykerb blocks the protein inside the cell. Because it uses a different mechanism to work, researchers do think Tykerb may be effective against HER2-positive cancers that have stopped responding to Herceptin.

Tykerb is an experimental drug, helps sta...

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