The ALK Break Apart FISH test detects chromosomal aberrations via fluorescence in situ hybridization (FISH) in formalin-fixed paraffin-embedded (FFPE) non-small cell lung cancer (NSCLC) tissue specimens. The FDA approved ALK kit is designed to detect rearrangements involving the ALK gene (2p23). Results from the ALK Kit are intended for use, in conjunction with and not in lieu of current standard diagnostic procedures, as an aid for the pathologist in the identification of patients eligible for treatment with XALKORI® (crizotinib).