The BT474 cell line was obtained from AstraZeneca (Cheshire, UK) [15 (link)]. SKBR3, MDA-MB-361, HCC1954, and HCC202 cell lines were from Dr. Joe Gray’s lab (Berkeley Lab, Berkeley, CA, USA) [16 (link), 17 (link)]. AU565, UACC812, and HCC-1569 cell lines were from ATCC. BT474, UACC-812, and MDA-MB-361 cell lines were maintained in Dulbecco’s modified Eagle medium (DMEM); SKBR3 cells were grown in McCoy’s 5A; and AU-565, HCC-1569, HCC-1954, and HCC-202 were cultured in RPMI 1640 modified with 1X L-glutamine with all media supplemented with 10% heat-inactivated fetal bovine serum and 1% penicillin-streptomycin-glutamine [17 (link), 18 (link)].