miR-337 is commonly overexpression in HER2-positive
breast cancers [41] and non-inflammatory breast cancer
samples from Tunisian women [42]. Another important
factor is miR-135a, which binds to the APC gene [43, 44],
and inhibits STAT3-induced pro survival gene expression
and induces apoptosis in gastric cancer and lymphoma
[45]. Future work will determine the impact of treatment
with FAK and STAT3 inhibitors on the TIC population in
MMTV-PyMT;ApcMin/+ cells as a means to regulate chemotherapeutic
resistance.
The MMTV-PyMT;ApcMin/+ cells exhibited increased
MDR1 expression, which would be expected to increase
chemotherapeutic resistance. MDR1 expression in
MMTV-PyMT;ApcMin/+ cells was augmented by doxorubicin
and paclitaxel but not with cisplatin (Fig. 1),
which is supported by currently published data that
MDR1 effluxes both doxorubicin and paclitaxel but not
cisplatin [12]. While studies have identified APC as a
driver of multidrug resistance through the Wnt/β-catenin
signaling in colorectal cancer [46–49], we have no