What is Xalkori?

Xalkori, which is also called crizotinib, is a drug that treats non-small cell lung cancer (NSCLC) after it has spread to other parts of the body.

Before Xalkori is prescribed, patients take a test to determine if they have changes in a certain gene, the anaplastic lymphoma kinase gene. The drug attacks the proteins produced by these mutations, so it's given only to those who test positive -- an estimated at 1% to 7% of NSCLC sufferers.

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