If I'm not mistaken Pfizer's PF1066 is the only ALK inhibitor currently in clinical trial. The AACR abstracts are out and although it's only pre-clinical data, in a direct comparison with PF1066 "AP26113 exhibited ~100-fold selectivity for ALK-positive lines compared with a ~10-fold selectivity for PF1066. At the highest doses tested, strong regressions were achieved with AP26113, but not PF1066."
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