Pharmacologic characterization of fluzoparib, a novel poly(ADP-ribose) polymerase inhibitor undergoing clinical trials.

Abstract

Poly(ADP-ribose) polymerase (PARP) enzymes play an important role in repairing DNA damage and maintaining genomic stability. Olaparib, the first-in-class PARP inhibitor, has shown remarkable clinical benefits in the treatment of BRCA-mutated ovarian or breast cancer. However, the undesirable hematological toxicity and pharmacokinetic properties of olaparib limit its clinical application. Here, we report the first preclinical characterization of fluzoparib (code name: SHR-3162), a novel, potent, and orally available inhibitor of PARP. Fluzoparib potently inhibited PARP1 enzyme activity and induced DNA double-strand breaks, G2 /M arrest, and apoptosis in homologous recombination repair (HR)-deficient cells. Fluzoparib preferentially inhibited the proliferation of HR-deficient cells and sensitized both HR-deficient and HR-proficient cells to cytotoxic drugs. Notably, fluzoparib showed good pharmacokinetic properties, favorable toxicity profile, and superior antitumor activity in HR-deficient xenografts models. Furthermore, fluzoparib in combination with apatinib or with apatinib plus paclitaxel elicited significantly improved antitumor responses without extra toxicity. Based on these findings, studies to evaluate the efficacy and safety of fluzoparib (phase II) and those two combinations (phase I) have been initiated. Taken together, our results implicate fluzoparib as a novel attractive PARP inhibitor.

• Authors: Lei Wang, Changyong Yang, Chengying Xie, Jiahua Jiang, Mingzhao Gao, Li Fu, Yun Li, Xubin Bao, Haoyu Fu, Liguang Lou
• Journal: Cancer science (Cancer Sci) Vol. 110 Issue 3 Pg. 1064-1075 (Mar 2019) ISSN: 1349-7006 [Electronic] England
• PMID: 30663191 (Publication Type: Journal Article)
• Copyright: © 2019 The Authors. Cancer Science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association.

Chemical References

• Antineoplastic Agents
• Phthalazines
• Piperazines
• Poly(ADP-ribose) Polymerase Inhibitors
• Poly(ADP-ribose) Polymerases
• olaparib

Topics

• Animals
• Antineoplastic Agents (pharmacology)
• Apoptosis (drug effects)
• Cell Line, Tumor
• Cell Proliferation (drug effects)
• Clinical Trials as Topic
• DNA Breaks, Double-Stranded (drug effects)
• DNA Repair (drug effects)
• Female
• Humans
• Mice
• Mice, Inbred BALB C
• Mice, Nude
• Phthalazines (pharmacology)
• Piperazines (pharmacology)
• Poly(ADP-ribose) Polymerase Inhibitors (pharmacology)
• Poly(ADP-ribose) Polymerases (metabolism)
• Rats
• Rats, Sprague-Dawley
• Xenograft Model Antitumor Assays (methods)