Monopar Therapeutics announced the acquisition of GPX-150 from privately held Gem Pharmaceuticals concurrent with $9.7 million of new financing.
"GPX-150 fits nicely into our growing portfolio of oncology drug candidates that range from our preclinical antitumor antibody MNPR-101 (formerly huATN-658) to our Phase III-ready Validive® program to prevent and treat severe oral mucositis in patients receiving radiation treatment for head and neck cancer," said Dr. Chandler Robinson, Monopar's CEO. "Having just closed on nearly $10 million in new financing, and with the recent filing of our Form 10 as a path toward the public listing of Monopar's securities, we are well on our way to becoming an active new contributor in the oncology therapeutic space."
GPX-150 has been engineered to retain the anticancer activity of doxorubicin while minimizing the potential for irreversible damage to the heart. Doxorubicin is currently approved by the FDA for use in 14 different cancer types. However, the ability to provide patients with optimal treatment exposure to doxorubicin is limited due to the risk of patients developing irreversible cardiotoxicity.
Decreased cardiotoxicity of GPX-150 compared to doxorubicin and other anthracyclines has been demonstrated in preclinical studies and several early clinical studies, supporting the safety and efficacy of GPX-150. A Phase I dose escalation study conducted at the University of Iowa enrolled 24 patients at five different dose levels of GPX-150 ranging from 14-265 mg/M2. No evidence of cardiotoxicity was observed in any of these patients, including four patients that had received prior anthracycline treatment. Fifty-three percent of patients showed disease stabilization, including three out of four patients with leiomyosarcoma.
Based on these favorable results, a multi-institutional single-arm Phase II clinical trial was conducted in patients with soft tissue sarcoma (STS). GPX-150 monotherapy demonstrated anticancer efficacy similar to that observed historically for doxorubicin in this indication, but with no evidence of irreversible cardiotoxicity.
Overall, GPX-150 showed a superior safety profile to that observed historically with doxorubicin. Monopar plans to leverage the favorable safety profile of GPX-150 to advance its development as a combination therapy in cancer indications where doxorubicin demonstrates a strong antitumor activity but its use has been restricted due to cardiotoxicity.