12
Nov
Mix of lapatinib and a SFK inhibitor partially blocked PI3K activation in the resistant cells and restored sensitivity to lapatinib in BT474 xenografts.95 There also appears to be a role for Src activity in resistance to trastuzumab. cell autonomous experiments and/or loss of function of PTEN. D. Signaling through bypass pathways (e.g., emanating from MET, IGF-1R, EphA2, or EpoR) participate the downstream effectors of HER2 such as PI3K-Akt either directly or through intracellular kinases such as Src. II. INTRINSIC HER2 ALTERATIONS A mechanism of resistance to inhibitors of HER2 is usually mutation of the target itself, resulting in alteration of…