Expression levels were highest in rapidly growing GIST-T1 when compared to the average of primary tumors (XIAP 60% of GIST-T1, survivin 50% of GIST-T1 expression levels; Figure 1A) with exception of cIAP1, where expression levels were comparable to GIST-T1 with variable expression ranging from 27 to 200% of GIST-T1 expression levels. This evidence concerns the gene BIRC2 and gastrointestinal stromal tumor.