ALK and lung cancer: Among the 5 ALK-positive cases with lung cancer, the following variants were identified (Fig. 4 and Table 5): three (60%) exhibited EML4-ALK-V3a fusion (cases 3, 4 and 5), one (20%) exhibited EML4-ALK-V5p fusion (case 5) and two (40%) exhibited EML4_ex13 fusion (cases 1 and 2).