We analyzed mutations of the KIT gene, expression of p55PIK and KIT, and phosphorylation of NF-κB p65 (Ser536) in surgically-dissected tumor samples before and after Imatinib treatment from 8 GIST patients (the initial Imatinib treatment of these patients are positive response, detailed information about the patients are shown in Supplementary Table S1). Here, NFKB1 is linked to gastrointestinal stromal tumor.