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|Ref Type||Journal Article|
|Authors||Oplustil O'Connor L, Rulten SL, Cranston AN, Odedra R, Brown H, Jaspers JE, Jones L, Knights C, Evers B, Ting A, Bradbury RH, Pajic M, Rottenberg S, Jonkers J, Rudge D, Martin NM, Caldecott KW, Lau A, O'Connor MJ|
|Title||The PARP Inhibitor AZD2461 Provides Insights into the Role of PARP3 Inhibition for Both Synthetic Lethality and Tolerability with Chemotherapy in Preclinical Models.|
|Date||2016 Oct 15|
|Abstract Text||The PARP inhibitor AZD2461 was developed as a next-generation agent following olaparib, the first PARP inhibitor approved for cancer therapy. In BRCA1-deficient mouse models, olaparib resistance predominantly involves overexpression of P-glycoprotein, so AZD2461 was developed as a poor substrate for drug transporters. Here we demonstrate the efficacy of this compound against olaparib-resistant tumors that overexpress P-glycoprotein. In addition, AZD2461 was better tolerated in combination with chemotherapy than olaparib in mice, which suggests that AZD2461 could have significant advantages over olaparib in the clinic. However, this superior toxicity profile did not extend to rats. Investigations of this difference revealed a differential PARP3 inhibitory activity for each compound and a higher level of PARP3 expression in bone marrow cells from mice as compared with rats and humans. Our findings have implications for the use of mouse models to assess bone marrow toxicity for DNA-damaging agents and inhibitors of the DNA damage response. Finally, structural modeling of the PARP3-active site with different PARP inhibitors also highlights the potential to develop compounds with different PARP family member specificity profiles for optimal antitumor activity and tolerability. Cancer Res; 76(20); 6084-94. ©2016 AACR.|
|Molecular Profile||Treatment Approach|
|Gene Name||Source||Synonyms||Protein Domains||Gene Description||Gene Role|
|Drug Name||Trade Name||Synonyms||Drug Classes||Drug Description|
|AZD2461||PARP Inhibitor (Pan) 22||AZD2461 inhibits PARP1 and PARP2, resulting in decreased tumor cell growth (PMID: 27550455, PMID: 28332364).|
|Gene||Variant||Impact||Protein Effect||Variant Description||Associated with drug Resistance|
|Molecular Profile||Indication/Tumor Type||Response Type||Therapy Name||Approval Status||Evidence Type||Efficacy Evidence||References|
|Unknown unknown||colorectal cancer||not applicable||Olaparib + Temozolomide||Preclinical - Cell line xenograft||Actionable||In a preclinical study, the addition of Lynparza (olaparib) to Temodar (temozolomide) resulted in greater antitumor activity than Temodar (temozolomide) alone in colorectal cancer cell line xenograft models, demonstrating decreased tumor volume (PMID: 27550455).||27550455|
|Unknown unknown||colorectal cancer||not applicable||AZD2461 + Temozolomide||Preclinical - Cell line xenograft||Actionable||In a preclinical study, the addition of AZD2461 to Temodar (temozolomide) resulted in greater antitumor activity than Temodar (temozolomide) alone in colorectal cancer cell line xenograft models, demonstrating decreased tumor volume (PMID: 27550455).||27550455|