From: An 8-gene mRNA expression profile in circulating tumor cells predicts response to aromatase inhibitors in metastatic breast cancer patients
8-gene CTC profile
PFS <9Â months
Favorable
Unfavorable
Total
 No
22
4
26
 Yes
7
12
19
29
16
45
Pearson’s X 2 statistic
10,93
P
<0.001