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MDA-MB-231 seems to be not normally her2+
Just did a quick check through pubmed. Clearest example: "Medium dose-effect analysis indicates that OSU-03012 potentiated trastuzumab's antiproliferative effect in HER2-positive cells, especially in SKBR3/IGF-IR cells, through the down-regulation of PDK-1/Akt signaling. This synergy, however, was not observed in HER2-negative MDA-MB-231 cells."
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