Xalkori (crizotinib) has a new warning in the FDA label: http://www.accessdata.fda.gov/drugsatfda_docs/label/2012/202570s003lbl.pdf WARNINGS AND PRECAUTIONS Hepatotoxicity: Drug-induced hepatotoxicity with fatal outcome has occurred. Monitor monthly and as clinically indicated with more frequent testing in patients with Grade 2-4 elevations. Temporarily suspend, dose reduce, or permanently discontinue XALKORI as indicated. This language was not in the original Xalkori label when the drug was approved by the FDA in Aug 2011.