CG-200745 is a novel inhibitor of histone deacetylases (HDACs), initially developed by CrystalGenomics, Inc for treatment of various hematological and solid cancers. Combinations of CG-200745 with SN38 (the active form of irinotecan), or oxaliplatin were more effective than the agents alone when used to inhibit the growth of HCT116 cells. The protein expressions of acetyl-H3, p21, caspase-3, -8, and -9, PARP, and XIAP were affected in a time- and dose-dependent manner in HCT116 cells treated with the CG-200745 alone or combined CG-200745 and SN-38. In HCT116 xenografts, the HDACI CG-200745 in combination with irinotecan dramatically inhibited tumor growth without showing additive toxicity.

BLZ 945, an orally active antagonist of the colony-stimulating factor1 receptor (CSF1R), is being developed by Novartis and Celgene Corporation for the treatment of advanced solid tumors and tumor-induced osteolytic lesions in bone and skeletal-related events. Phase I/II development for solid tumors is underway in the US, Italy, Spain, and Singapore. Preclinical trials were ongoing for tumor-induced osteolysis in Europe and the US. However, no recent reports of development had been identified for this indication.

AMG-319 is an oral, small molecule inhibitor of PI3Kdelta which is now being tested in phase II for the treatment of head and neck squamous cell carcinoma and in phase I for lymphoid malignancy.

VS-5584 is a potent and selective oral small molecule inhibitor of all 4 PI3K isoforms and mTORC1 and mTORC2. VS-5584 inhibits mTOR, PI3Kα/β/δ/γ with IC50 of 3.4 nM and 2.6-21 nM, respectively. Verastem has patent protection of VS-5584 through 2029, and has received orphan drug designation for VS-5584 in mesothelioma in the US and EU. Verastem is currently conducting a Phase 1 trial of VS-5584 in patients with advanced solid tumors and lymphomas.