TMAs of 753 NSCLCs were tested for ALK-alterations by FISH and IHC.
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5.7% showed alterations between 10% and 20% (ALK-FISH borderline group).
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Partly these samples showed conflicting IHC results.
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Based on a sharp cut-off point (15%), ALK-FISH misclassifications occur frequently.
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Based on a borderline interval, ALK-FISH misclassifications can be reduced clearly.
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