PTK2 and small cell lung carcinoma: We analyzed the expression of FAK splicing variants in SCLC cell lines using data from the CCLE dataset on the Cancer Dependency Portal (DepMap; https://depmap.org/portal/ccle/)65 and found that 40 (87.0%) of the 46 SCLC cell lines investigated harbored Box 6/Box 7 (Supplementary Fig. 11a).