Symbol # of mutant samples Percentage of the mutant samples
PIK3CA 263 33.89%
TP53 258 33.25%
GATA3 81 10.44%
MAP3K1 57 7.35%
CDH1 55 7.09%
MAP2K4 32 4.12%
PTEN 29 3.74%
RUNX1 25 3.22%
PIK3R1 21 2.71%
MED12 20 2.58%
AKT1 19 2.45%
NF1 19 2.45%
CTCF 18 2.32%
ATM 17 2.19%
ARID1A 16 2.06%
CBFB 16 2.06%
SPEN 16 2.06%
RB1 14 1.80%
SF3B1 14 1.80%
BRCA2 13 1.68%
ERBB2 13 1.68%
MLL2 13 1.68%
BRCA1 12 1.55%
GRIN2A 12 1.55%
MTOR 12 1.55%
ERBB3 11 1.42%
SETD2 11 1.42%
BCORL1 10 1.29%
KDM6A 10 1.29%
PRKDC 10 1.29%
Table 2: FoundationOne genes frequently mutated in TCGA breast cancer samples