On January 12, 2015 Tokai Pharmaceuticals reported that it has entered into an agreement with the Johns Hopkins University related to the development of a companion diagnostic to determine the AR-V7 status of patients with castration-resistant prostate cancer (CRPC) for use with the Company’s lead product, galeterone, which is in development for the treatment of AR-V7 positive metastatic CRPC (Filing 8-K , Tokai Pharmaceuticals, JAN 15, 2015, View Source [SID:1234501348]).
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Under the agreement, the Company has obtained an exclusive, worldwide license from the Johns Hopkins University to patent applications and know-how covering an assay that has been used to determine the AR-V7 status of prostate cancer patients.
AR-V7 positive prostate tumors express a truncated form of the androgen receptor (AR). These truncated ARs are missing the C-terminal end of the receptor that contains the ligand binding domain, which is known as C-terminal loss. The AR splice variant AR-V7 is the most prevalent of the splice variants that cause C-terminal loss.
Clinical data from a prospective trial at the Johns Hopkins University as well as retrospective analyses of studies at MD Anderson Cancer Center and Memorial Sloan Kettering Cancer Center have shown that AR-V7 specifically and C-terminal loss generally is associated with poor responsiveness to Zytiga (abiraterone acetate) and Xtandi (enzalutamide), two commonly used oral therapies for metastatic CRPC. The Company believes that galeterone has the potential to treat patients with AR-V7 based on data from preclinical studies and retrospective data in patients with C-terminal loss from the Company’s Phase 2 ARMOR2 trial of galeterone.
"We are pleased to have formalized the agreement with the Johns Hopkins University to support our ongoing AR-V7 companion diagnostic program. This license adds to the intellectual property around galeterone and is a critical milestone in the development of the companion diagnostic that will be used in our 148 patient Phase 3 ARMOR3-SV trial scheduled to begin in the first half of this year," stated Jodie Morrison, president and chief executive officer of Tokai Pharmaceuticals. "It is our hope that future availability of a companion diagnostic will allow prostate cancer patients and their physicians to make more informed decisions regarding their care."
In addition, the Company announced that it has entered into an agreement with Qiagen N.V. under which Qiagen will develop a non-invasive companion diagnostic utilizing an array of novel technologies for use with galeterone. The agreement formalizes an existing collaboration under which work has been ongoing.