BMN-673 (8R,9S) is the (8R,9S) enantiomer of BMN-673, known as talazoparib. BMN 673 is a novel inhibitor of nuclear enzyme poly (ADP-ribose) polymerase (PARP) with potential antineoplastic activity.

Niraparib (MK-4827) displays excellent PARP 1 and 2 inhibition. Inhibition of PARP in the context of defects in other DNA repair mechanisms provide a tumor specific way to kill cancer cells. Niraparib is in development with TESARO, under licence from Merck & Co, for the treatment of cancers (ovarian, fallopian tube and peritoneal cancer, breast cancer, prostate cancer and Ewing's sarcoma). Niraparib was characterized in a number of preclinical models before moving to phase I clinical trials, where it showed excellent human pharmacokinetics suitable for once a day oral dosing, achieved its pharmacodynamic target for PARP inhibition, and had promising activity in cancer patients. It is currently being tested in phase 3 clinical trials as maintenance therapy in ovarian cancer and as a treatment for breast cancer.

N-Gene Research Laboratories is developing BGP-15 (NP-51), a small molecule, orally available, indirect Jun kinase (JNK) inhibitor and insulin sensitiser, for glycaemic control in patients with type-2 diabetes mellitus, and as an adjunct treatment for insulin resistance due to antipsychotics or obesity. In March 2002, N-Gene Research Laboratories granted Allos Therapeutics an exclusive license to its intellectual property surrounding BGP 15 in the US. BGP-15 has previously been used in clinical trials for the treatment of skeletal muscle pathology associated with Type 2 Diabetes (through insulin sensitization), Duchenne Muscular Dystrophy (DMD) and heart failure (through anti-inflammatory and anti-fibrotic mechanisms). Via its action as a modulator of the cytoprotective response to cellularstress, and specifically as a poly (ADP-ribose) polymerase (PARP) inhibitor, heat shock protein-inducer, membrane lipid therapeutic and an antioxidant inducer, BGP-15 has previously been shown to protect against skeletal muscle dysfunction, damage and wasting.

E7449 also known as 2X-121 (8-(isoindolin-2-ylmethyl)-2,9-dihydro- 3H-pyridazino[3,4,5-de]quinazolin-3-one) is an orally bioavailable, brain penetrable, small molecule dual Poly(ADP-ribose) polymerase /Tankyrase inhibitor that is not a substrate for P-glycoprotein. It demonstrates potent antineoplastic potential both in vivo and in vitro. 2X Oncology is developing E7449 for the treatment of solid cancers.

Veliparib (ABT-888) is a potent inhibitor of PARP, has good oral bioavailability, can cross the blood-brain barrier, and potentiates temozolomide, platinums, cyclophosphamide, and radiation in syngeneic and xenograft tumor models. AbbVie is developing veliparib for the treatment of cancers. Clinical trials are underway worldwide, investigating veliparib primarily as part of a combination therapy in oncology indications such as brain, colorectal, melanoma, ovarian, prostate and pancreatic cancers.

Iniparib (BSI-201 or 4-iodo-3-nitrosobenzamide) inactivated poly(ADP-ribose) polymerase by zinc ejection from the first zinc finger of this nuclear protein. Iniparib, either alone or in combination with chemotherapy, had significant antitumor activity in preclinical studies in vitro and in vivo. In June 2013, Sanofi dropped the drug after it failed in a phase III trial of patients with squamous non–small-cell lung cancer and a phase II trial in platinum-resistant ovarian cancer.

KU0058948 is an inhibitor of Poly(ADP-ribose) polymerase (PARP). In addition KU0058948 was shown to activate extracellular signal-regulated kinase 8 (ERK8). It affects viability of leukemia, pancreatic and endometrial cancer cells.

PJ34 is PARP inhibitor. It protects primary neuronal cells from oxygen-glucose deprivation in vitro and reduces infarct size following cerebral and cardiac ischemia in vivo. PJ34 exhibit suppresses cell growth and enhances the suppressive effects of cisplatin in liver cancer cells.