NCIt definition : A lung non-small cell carcinoma (NSCLC) characterized by the presence of rearrangements
of the ALK gene that lead to activation of ALK kinase and ALK driven tumor formation.
These rearrangements were initially identified as EML4-ALK fusions, but a variety
of other ALK gene fusions were subsequently identified. Approximately 5% of patients
with NSCLC carry ALK rearrangements and are highly sensitive to treatment with ALK
inhibitors.;