|Chemical and physical data|
|Molar mass||292.03 g/mol|
|3D model (Jmol)|
|(what is this?)|
Iniparib (INN, previously known as BSI 201) was a drug candidate for cancer treatment. It was originally believed to act as an irreversible inhibitor of PARP1 (hence, a PARP inhibitor) and possibly other enzymes through covalent modification, but its effects against PARP were later disproven. It underwent clinical trials for treatment of some types of breast cancer, but was discontinued after disappointing phase III clinical trials.
Iniparib was the first putative PARP inhibitor to commence phase III clinical trials. The first was for breast cancer, another was for squamous-cell lung cancer. Preliminary results in June 2009 on triple-negative breast cancer were promising. Later results showed increased median survival of triple-negative breast cancer patients from 7.7 to 12.2 months.
Iniparib was also studied as a potential chemotherapeutic agent in the fight against malignant glioma, including glioblastoma. Glioma is a resilient type of primary brain tumor (not metastatic) that currently has limited effective therapies, especially for patients whose tumors are in an inoperable location of the brain, such as the interior of the brainstem.
During the 2013 American Society of Clinical Oncology conference, Sanofi disclosed that iniparib failed to help lung-cancer patients in a late-stage trial, prompting the company to end research into the once-promising compound and take a $285 million charge.
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- Development of PARP Inhibitors: An Unfinished Story, Jan 2010
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- Liu, X; Shi, Y; Maag, DX; Palma, JP; Patterson, MJ; Ellis, PA; Surber, BW; Ready, DB; et al. (2012). "Iniparib nonselectively modifies cysteine-containing proteins in tumor cells and is not a Bona Fide PARP inhibitor". Clinical Cancer Research. 18 (2): 510–23. doi:10.1158/1078-0432.CCR-11-1973. PMID 22128301.
- Patel, AG; De Lorenzo, SB; Flatten, KS; Poirier, GG; Kaufmann, SH (2012). "Failure of Iniparib to Inhibit Poly(ADP-Ribose) Polymerase in Vitro". Clinical Cancer Research. 18 (6): 1655–62. doi:10.1158/1078-0432.CCR-11-2890. PMC . PMID 22291137.
- BSI 201
- "New breast cancer drugs block cell repair enzyme". Reuters. 2009-05-31.
- "PARP Inhibitors in Oncology. Chemosensitizers or Single-Agent Therapeutics?" (PDF). July 2009.
- "A Phase 3, Multi-Center Study of Gemcitabine/Carboplatin, With or Without BSI-201, in Patients With ER-, PR-, and Her2-Negative Metastatic Breast Cancer". 2009 to 2012, Primary completion date June 2011
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- Joyce O'Shaughnessy, Lee Schwartzberg, Michael A. Danso et al. (2014-12-01). "Phase III Study of Iniparib Plus Gemcitabine and Carboplatin Versus Gemcitabine and Carboplatin in Patients With Metastatic Triple-Negative Breast Cancer". J. Clin. Oncol. 32 (34): 3840–7. doi:10.1200/JCO.2014.55.2984. PMID 25349301. Retrieved 2015-07-24.
- "Sanofi Ends Iniparib Research".