This article has been updated to correct the name of the Phase I extension trial to Study 1001. Originally published June 3.

CHICAGO – A small subset of non-small cell lung cancer patients with tumors that have rearrangements in the ROS1 gene have responded so well to Pfizer's Xalkori (crizotinib) in clinical trials that some academic medical oncologists are already incorporating screening for this molecular marker into clinical practice.

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