MedKoo product information:

Regorafenib

Regorafenib is an orally bioavailable small molecule with potential antiangiogenic and antineoplastic activities. Regorafenib binds to and inhibits vascular endothelial growth factor receptors (VEGFRs) 2 and 3, and Ret, Kit, PDGFR and Raf kinases, which may result in the inhibition of tumor angiogenesis and tumor cell proliferation. VEGFRs are receptor tyrosine kinases that play important roles in tumor angiogenesis; the receptor tyrosine kinases RET, KIT, and PDGFR, and the serine/threonine-specific Raf kinase are involved in tumor cell signaling. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus).

Current developer:    Bayer HealthCare Pharmaceutical, Bayer Schering Pharma.

Regorafenib (also known as BAY 73-4506) is an oral multi-kinase inhibitor developed by Bayer which targets angiogenic, stromal and oncogenic receptor tyrosine kinase (RTK). Regorafenib shows anti-angiogenic activity due to its dual targeted VEGFR2-TIE2 tyrosine kinase inhibition. It is currently being studied as a potential treatment option in multiple tumor types.

Regorafenib (BAY 73-4506), a novel oral multikinase inhibitor, potently inhibits these endothelial cell kinases in biochemical and cellular kinase phosphorylation assays. Furthermore, regorafenib inhibits additional angiogenic kinases (VEGFR1/3, platelet-derived growth factor receptor-β, and fibroblast growth factor receptor 1) and the mutant oncogenic kinases c-KIT, RET, and B-RAF. The antiangiogenic effect of regorafenib was demonstrated in vivo by dynamic contrast-enhanced magnetic resonance imaging. Regorafenib administered once orally at 10 mg/kg significantly decreased the extravasation of Gadomer in the vasculature of rat GS9L glioblastoma tumor xenografts. In a daily (qd)×4 dosing study, the pharmacodynamic effects persisted for 48 hr after the last dosing and correlated with tumor growth inhibition (TGI). A significant reduction in tumor microvessel area was observed in a human colorectal xenograft after qd×5 dosing at 10 and 30 mg/kg. Regorafenib exhibited potent dose-dependent TGI in various preclinical human xenograft models in mice, with tumor shrinkages observed in breast MDA-MB-231 and renal 786-O carcinoma models. Pharmacodynamic analyses of the breast model revealed strong reduction in staining of proliferation marker Ki-67 and phosphorylated extracellular regulated kinases 1/2. These data demonstrate that regorafenib is a well-tolerated, orally active multikinase inhibitor with a distinct target profile that may have therapeutic benefit in human malignancies. [source: http://www.ncbi.nlm.nih.gov/pubmed].

Bayer Schering Pharma has started enrolling patients in an international Phase III trial to evaluate its investigational compound regorafenib (BAY 73-4506) for the treatment of patients with metastatic colorectal cancer (CRC) who have progressed after standard therapies. Bayer said that Regorafenib is a potent oral multi-kinase inhibitor with a kinase inhibition profile targeting angiogenic, stromal and oncogenic receptor tyrosine kinases.  The Correct (Patients with metastatic colorectal cancer treated with regorafenib or placebo after failure of standard therapy) trial is an international, multicenter, randomized, double-blind, placebo-controlled study that will enroll approximately 690 patients with metastatic CRC who have progressed after standard therapies. According to the study, patients will be randomized to receive either regorafenib plus best supportive care (BSC) or placebo plus BSC. Treatment cycles will consist of 160 mg of regorafenib (or matching placebo) once daily for three weeks/one week off plus BSC. [Source: http://clinicaltrials.pharmaceutical-business-review.com/news/bayer_begins_regorafenib_phase_iii_trial_100507].

1: Chu E. An Update on the Current and Emerging Targeted Agents in Metastatic Colorectal Cancer. Clin Colorectal Cancer. 2011 Jul 11. [Epub ahead of print] PubMed PMID: 21752724.

2: Demetri GD. Differential properties of current tyrosine kinase inhibitors in gastrointestinal stromal tumors. Semin Oncol. 2011 Apr;38 Suppl 1:S10-9. Review.  Erratum in: Semin Oncol. 2011 Jun;38(3):467. PubMed PMID: 21419931.

3: Wilhelm SM, Dumas J, Adnane L, Lynch M, Carter CA, Schütz G, Thierauch KH, Zopf D. Regorafenib (BAY 73-4506): a new oral multikinase inhibitor of angiogenic, stromal and oncogenic receptor tyrosine kinases with potent preclinical antitumor activity. Int J Cancer. 2011 Jul 1;129(1):245-55. doi: 10.1002/ijc.25864. Epub 2011 Apr 22. PubMed PMID: 21170960.