IQGAP3 and gastric neoplasm: IQGAP3 expression between patients from different races and with different TP53 mutation status was statistically significantly different (Figure S4); gastric tumors from African-American patients and those with TP53 mutations exhibited higher IQGAP3 expression than in Caucasians (p < 0.05) and in tumors without TP53 mutations (p < 0.001), respectively.