Table 1.

Frequency of ALK rearrangements in lung cancer patients

	All patients	Adenocarcinoma as submitting diagnosis
ALK rearrangement	49a	38b
Total cases	1387	1011
% ALK rearrangement	3.5%	3.7%

^a One patient had large cell carcinoma and 10 patients were diagnosed as carcinomas without further typing. Two of the 49 patients had a deletion of 3^′ end signal, which should be regarded as negative for ALK rearrangement. ^bOne patient showed a deletion of 5^′ALK and amplification of the 3^′ end signal.