CP 724714 is an orally bioavailable, quinazoline-based, selective small molecule inhibitor of the HER2/erbB2 receptor tyrosine kinase. The compound could have particular potential in the treatment of women with metastatic breast cancer, of which 25-30% over express HER2/erbB2. CP 724714 was in preclinical development with Pfizer.

Saprisartan (formerly known as GR 138950) was developed as a potent long-lasting angiotensin II (AT1) receptor antagonist with high oral bioavailability. The drug was used for the treatment of hypertension and heart failure. However, these studies were discontinued.

Foropafant is a platelet-activating factor (PAF) antagonist which was developed by Sanofi. It was in clinical development for the treatment of asthma, thrombosis and ulcerative colitis. The development of the drug was discontinued due to lack of efficacy.

Naluzotan (PRX-00023), a small molecule, non-azapirone, dual serotonin (5-HT)1A receptor agonist and sigma-1 receptor antagonist, is under development with Proximagen for the treatment of epilepsy. In previous clinical trials, the compound was shown to be safe and well-tolerated in over 400 patients. Epilepsy patients with localisation-related epilepsy have reduced 5-HT1a receptor binding as indicated by positron emission tomography (PET scan). It is thought that by increasing neurotransmitter activity at 5-HT1a receptor sites, seizure incidence and severity may be decreased.

Denibulin is a novel antineoplastic agent. Denibulin selectively targets and reversibly binds to the colchicine-binding site on tubulin and inhibits microtubule assembly. This results in the disruption of the cytoskeleton of tumor endothelial cells, ultimately leading to cell cycle arrest, blockage of cell division and apoptosis. This causes inadequate blood flow to the tumor and eventually leads to a decrease in tumor cell proliferation. Denibulin hydrochloride had been in phase I clinical trials for the treatment of solid tumours. It was generally well tolerated and showed decrease in tumor vascular parameters. However, no recent development has been reported.

CP-866087 is a mu opioid receptor antagonist, discovered by Pfizer. The compound was able to antagonize the effect of morphine in a rodent tail flick assay and produced a dose-dependent decrease in alcohol intake in alcohol-preferring rats. The compound was investigated in clinical trials for the treatment of obesity, alcoholism and female sexual arousal disorder. In the later study, although improvements were seen with CP-866,087 in the key efficacy endpoints, there was no clinical treatment benefit over placebo.

Rigosertib sodium (ON 01910.Na) is a small molecule inhibitor of critical pathways important in the growth and survival of cancer cells, being developed by Onconova Therapeutics ("Onconova") for the treatment of hematologic malignancies and solid tumors. Rigosertib (ON-01910) is a non-ATP-competitive inhibitor of PLK1 with IC50 of 9 nM in a cell-free assay. It shows 30-fold greater selectivity against Plk2 and no activity to Plk3. Extensive Phase I and Phase II studies with rigosertib have been conducted at leading institutions in the U.S. and abroad in more than 450 patients with solid tumors and hematological cancers, including MDS and AML. MDS and AML are blood disorders widely recognized as difficult to manage, with limited therapeutic options available for patients, especially those with drug-resistant disease. The multi-site Phase III ONTIME trial in MDS patients is under a Special Protocol Assessment (SPA) from the U.S. FDA and is being supported by an award from the Therapeutics Acceleration Program (TAP) of the Leukemia and Lymphoma Society (LLS). FDA has granted Orphan Drug Designation for the use of rigosertib in MDS. The clinical program in solid tumors is also advancing with initiation of the Phase II/III combination ONTRAC trial (ON 01910.Na TRial in Patients with Advanced Pancreatic Cancer) and Phase II single agent trial in ovarian cancer. In Japan, SymBio is developing rigosertib for the treatment of refractory/relapsed HR-MDS (IV form) and first-line LR-MDS (oral form).

Elgodipine (IQB-875, CAS 119413-55-7) is a phenyldihydropyridine derivative acting as a calcium channel antagonist. Elgodipine inhibited both T- and L-type calcium channels in a concentration-dependent manner. Elgodipine was in clinical trials for the treatment of cardiovascular diseases however its development has been discontinued.

Varlitinib (Alternative Names: ARRY-334543; ARRY-543; ASLAN-001; Varlitinib tosylate) is a small molecule based reversible pan-HER inhibitor of EGFR, HER2 and HER4. In response to the binding of various ligands, these kinases undergo heterodimerisation and homodimerization, resulting in activation of numerous growth factor signaling pathways, by inhibiting the activation of the HER receptors via drug, effects such as shrinkage of the tumor and longer survival can be anticipated. In a large variety of cancers, the overexpression and/or constitutive activation of EGFR and HER2 are often observed and frequently correlate with poor clinical prognosis. Licensed from Array BioPharma with global rights for all indications, varlitinib is being developed as first-in-class drug for cholangiocarcinoma, gastric and colorectal cancer, and as best-in-class drug for breast cancer.

Ezlopitant (CJ-11974) is a non-peptide neurokinin-1 receptor antagonist. Pfizer was developing ezlopitant for the potential treatment of irritable bowel syndrome and chemotherapy-induced emesis. Development of ezlopitant has been discontinued.