ABT-888, an orally active poly(ADP-ribose) polymerase inhibitor that potentiates DNA-damaging agents in preclinical tumor models

Cherrie K. Donawho, Yan Luo, Yanping Luo, Thomas D. Penning, Joy L. Bauch, Jennifer J. Bouska, Velitchka D. Bontcheva-Diaz, Bryan F. Cox, Theodore L. DeWeese, Larry E. Dillehay, Debra C. Ferguson, Nayereh S. Ghoreishi-Haack, David R. Grimm, Ran Guan, Edward K. Han, Rhonda R. Holley-Shanks, Boris Hristov, Kenneth B. Idler, Ken Jarvis, Eric F. JohnsonLawrence R. Kleinberg, Vered Klinghofer, Loren M. Lasko, Xuesong Liu, Kennan C. Marsh, Thomas P. McGonigal, Jonathan A. Meulbroek, Amanda M. Olson, Joann P. Palma, Luis E. Rodriguez, Yan Shi, Jason A. Stavropoulos, Alan C. Tsurutani, Gui Dong Zhu, Saul H. Rosenberg, Vincent L. Giranda, David J. Frost

Research output: Contribution to journalArticlepeer-review


Purpose: To evaluate the preclinical pharmacokinetics and antitumor efficacy of a novel orally bioavailable poly(ADP-ribose) polymerase (PARP) inhibitor, ABT-888. Experimental Design: In vitro potency was determined in a PARP-1 and PARP-2 enzyme assay. In vivo efficacy was evaluated in syngeneic and xenograft models in combination with temozolomide, platinums, cyclophosphamide, and ionizing radiation. Results: ABT-888 is a potent inhibitor of both PARP-1 and PARP-2 with Kis of 5.2 and 2.9 nmol/L, respectively. The compound has good oral bioavailability and crosses the blood-brain barrier. ABT-888 strongly potentiated temozolomide in the B16F10 s.c. murine melanoma model. PARP inhibition dramatically increased the efficacy of temozolomide at ABT-888 doses as low as 3.1 mg/kg/d and a maximal efficacy achieved at 25 mg/kg/d. In the 9L orthotopic rat glioma model, temozolomide alone exhibited minimal efficacy, whereas ABT-888, when combined with temozolomide, significantly slowed tumor progression. In the MX-1 breast xenograft model (BRCA1 deletion and BRCA2 mutation), ABT-888 potentiated cisplatin, carboplatin, and cyclophosphamide, causing regression of established tumors, whereas with comparable doses of cytotoxic agents alone, only modest tumor inhibition was exhibited. Finally, ABT-888 potentiated radiation (2 Gy/d x 10) in an HCT-116 colon carcinoma model. In each model, ABT-888 did not display single-agent activity. Conclusions: 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. This broad spectrum of chemopotentiation and radiopotentiation makes this compound an attractive candidate for clinical evaluation.

Original languageEnglish (US)
Pages (from-to)2728-2737
Number of pages10
JournalClinical Cancer Research
Issue number9
StatePublished - May 1 2007

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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