BIRC5 and non-small cell lung carcinoma: The IAP proteins, XIAP and survivin, were detected in almost all the cells tested; XIAP was highly expressed in all the 12 cell lines tested and survivin was also overexpressed in 8 out of the 12 NSCLC cell lines, confirming their tumorigenic effect in previous reports,1,3 although immortalized lung cell line, Beas2B, also expressed high level of survivin (Figure 1b).