In vitro study | NVP-ADW742 is more than 6 times more selective at IGF-1R than at insulin receptor (InsR), with an IC50 of 2.8 μm, and has the lowest inhibitory activity at c-Kit, HER1, PDGFR, VEGFR-2, or Bcr-Abl p210, IC50>5-10 μm, consistent with significant inhibition of IGF-1-induced phosphorylation of IGF-1R and its downstream target, Akt. NVP-ADW742 significantly inhibited the proliferation of a variety of cells stimulated by serum in a dose-dependent manner, with IC50 of 0.1-0.5 μm in multiple myeloma (MM) cell lines, co-culture with BMSCs could not overcome the anticancer effect on MM. In the presence of serum, NVP-ADW742 also abrogated the tumor cell response to IL-6. In addition, NVP-ADW742 effectively acts on MM cell lines against conventional anti-cancer agents (toxic chemotherapeutic agents, Dexamethasone) or anti-cancer agents for research (Thalidomide, CC-5013, TRAIL/Apo2L, PS-341), it also effectively acts on primary tumor cells in MM patients who are resistant to multiple drugs. NVP-ADW742 acts on tumor cells and bone marrow stromal stem cells, reduces VEGF production, and inhibits IGF-1-induced VEGF secretion in a variety of tumor types, such as thyroid cancer cells and MM cells. The 0.75 μm NVP-ADW742 inhibits IGF-1R and also sensitizes MM cells or prostate cancer cells to other anti-cancer agents such as Doxorubicin, Melphalan, Dexamethasone, TRAIL/Apo2L, or PS-341. |