ARRY-380

IC50: 8 nM (HER2)

HER2 is a member of the human epidermal growth factor receptor (HER/EGFR/ERBB) family. Amplification or overexpression of this oncogene has been shown to play an important role in the development and progression of certain aggressive types of breast cancer. ARRY-380 is an orally bioavailable inhibitor of the human epidermal growth factor receptor tyrosine kinase ErbB-2 (also called HER2) with potential antineoplastic activity.

In vitro: ARRY-380 is reported to be a reversible, ATP-competitive inhibitor with nanomolar activity against HER2 enzyme. In cell-based assays, ARRY-380 is ~500-fold selective for HER2 vs. EGFR and is equipotent against truncated p95-HER2 [1].

In vivo: ARRY-380 treatment significantly enhances survival in two ErbB2 driven intracranial tumor xenograft models, with superior activity compared to other ErbB2 agents in these studies. Additionally, ARRY-380 has demonstrated durable clinical activity in heavily pre-treated patients with ErbB2+ MBC. These preclinical and clinical data suggest that ARRY-380 may provide benefit to patients with ErbB2+ MBC with brain metastases. These preclinical and clinical data suggest that ARRY-380 may provide benefit to patients with ErbB2+ MBC with brain metastases and warrants further study [2].

Clinical trial: In a phase 1 clinical trial, 15 patients have been treated in 5 dosing cohorts at doses of 25 to 300 mg BID. No DLTs have been observed and drug-related adverse events have included Grade 1 nausea, rash and fatigue and Grade 2 fatigue in 2 patients at the 200 mg BID dose level. Preliminary PK analyses indicate a trend for increasing Cmax and AUC with increasing dose, a median Tmax of 2 hours and a mean t1/2 of 4.6 hours across all cohorts. Two patients with HER2+ breast cancer have had stable disease for ≥ 4 months with no significant toxicity. One of these two patients had a notable reduction in liver metastases (28%) after 2 cycles of ARRY-380 and is currently on study.These findings indicate ARRY-380 has demonstrated an acceptable safety and PK profile and preliminary signs of clinical benefit. Dose escalation continues to determine the MTD [3].

References:
[1] S.  L. Moulder, V. Borges, S. K. L. Chia, T. Baetz, E. Barrett, J. Garrus, K. Guthrie, C. Kass, E. Laird, J. Lyssikatos, F. Marmsater, E. Wallace. ARRY-380, a Selective HER2 Inhibitor: From Drug Design to Clinical Evaluation. Poster of AACR-NCI-EORTC, Nov 12-16, 2011, San Francisco, CA.
[2] Victoria Dinkel, Deborah Anderson, Shannon Winski, Jim Winkler, Kevin Koch and Patrice Lee.  ARRY-380, a potent, small molecule inhibitor of ErbB2, increases survival in intracranial ErbB2+ xenograft models in mice. Poster available at www.arraybiopharma.com
[3] S.  Chia, T. Baetz, S. D'Aloisio, G. Fernetich, B. Freeman, E. Barrett, C. Kass, J. Kang, B. Sajan, S. Moulder, and J. Garrus. A Phase 1 Study To Assess the Safety, Tolerability and Pharmacokinetics of ARRY-380 – An Oral Inhibitor of HER2. Cancer Res 2009;69(24 Suppl):Abstract nr 5111.

Phase I Study of ONT-380, a HER2 Inhibitor, in Patients with HER2(+)-Advanced Solid Tumors, with an Expansion Cohort in HER2(+) Metastatic Breast Cancer (MBC).[Pubmed:28053022]

Clin Cancer Res. 2017 Jul 15;23(14):3529-3536.

Purpose: ONT-380 (ARRY-380) is a potent and selective oral HER2 inhibitor. This Phase I study determined the MTD, pharmacokinetics (PK) and antitumor activity of ONT-380 in HER2-positive advanced solid tumors, with an expansion cohort of patients with HER2(+) MBC.Experimental Design: ONT-380 was administered twice daily (BID) in continuous 28-day cycles. After a modified 3+3 dose-escalation design determined the MTD, the expansion cohort was enrolled. PK properties of ONT-380 and a metabolite were determined. Response was evaluated by Response Evaluation Criteria in Solid Tumors (RECIST).Results: Fifty patients received ONT-380 (escalation = 33; expansion = 17); 43 patients had HER2(+) MBC. Median prior anticancer regimens = 5. Dose-limiting toxicities of increased transaminases occurred at 800 mg BID, thus 600 mg BID was the MTD. Common AEs were usually Grade 1/2 in severity and included nausea (56%), diarrhea (52%), fatigue (50%), vomiting (40%) constipation, pain in extremity and cough (20% each). 5 patients (19%) treated at MTD had grade 3 AEs (increased transaminases, rash, night sweats, anemia, and hypokalemia). The half-life of ONT-380 was 5.38 hours and increases in exposure were approximately dose proportional. In evaluable HER2(+) MBC (n = 22) treated at doses >/= MTD, the response rate was 14% [all partial response (PR)] and the clinical benefit rate (PR + stable disease >/= 24 weeks) was 27%.Conclusions: ONT-380 had a lower incidence and severity of diarrhea and rash than that typically associated with current dual HER2/EGFR inhibitors and showed notable antitumor activity in heavily pretreated HER2(+) MBC patients, supporting its continued development. Clin Cancer Res; 23(14); 3529-36. (c)2017 AACR.

ARRY-380 analog, an inhibitor of EGFR (ErbB1), is extracted from patent WO2015153959A2, compound 249. ARRY-380 is a potent, selective, ATP-competitive, orally active inhibitor of HER2.

ARRY-380,937265-83-3,Natural Products,EGFR, buy ARRY-380 , ARRY-380 supplier , purchase ARRY-380 , ARRY-380 cost , ARRY-380 manufacturer , order ARRY-380 , high purity ARRY-380