On November 25, 2019 Medicenna Therapeutics Corp. ("Medicenna" or "the Company") (TSX: MDNA,OTCQB: MDNAF), a clinical stage immuno-oncology company, reported that it has presented updated clinical results from its Phase 2b trial of MDNA55 in patients with recurrent Glioblastoma (rGBM), the most common and uniformly fatal form of brain cancer (Press release, Medicenna Therapeutics, NOV 25, 2019, View Source [SID1234551674]).
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The results were presented by Dr. John Sampson, MD, PhD, a Robert H. and Gloria Wilkins Distinguished Professor and Chair of Neurosurgery at Duke University School of Medicine at the 24th Society for Neuro-Oncology (SNO) annual meeting on November 24th, 2019 at the JW Marriott Desert Ridge Resort in Phoenix, Arizona. Dr. Sampson discussed updated efficacy results from the Phase 2b clinical trial of MDNA55 in rGBM patients using the interleukin 4 receptor (IL4R) as an immunotherapy target. IL4R is a biomarker for a more aggressive form of GBM which is overexpressed in 75% of glioblastoma patients, as well as in cells that make up the brain tumor microenvironment (TME).
"In this trial, particularly for patients with IL4R over-expression, a prognostic factor that is known to contribute to poor survival, it is gratifying to see that a single treatment with MDNA55 is able to produce impressive survival and tumor control." stated Dr. Sampson. "By combining precise drug delivery and a targeted therapy, MDNA55 could potentially provide new hope to a large majority of brain cancer patients expressing an important immunotherapeutic biomarker."
"We are delighted with the results of the Phase 2b trial thus far. We believe these results are evidence of the opportunity for MDNA55 to become a leading treatment option for a sizeable patient population with this devastating disease," said Dr. Fahar Merchant, President and CEO of Medicenna. "Results from 112 rGBM patients enrolled in this and earlier clinical trials show substantial improvements in tumor control and survival rates when compared to approved therapies for rGBM, and provide a comprehensive data package for our planned meetings with regulatory agencies early next year."
Highlights from the presentation include:
With a single treatment with MDNA55, a therapy designed to target the IL4R, the median overall survival (mOS) in IL4RHigh subjects (n=21) is 15 months. This shows a survival advantage of up to nine months when compared to approved therapies (mOS of 5.4 to 9.2 months with Temozolomide, Avastin and Lomustine).
Among the 38 evaluable subjects, irrespective of IL4R expression, 82% of the subjects experienced tumor shrinkage or stabilization from nadir. The mOS of patients showing tumor control (n=31) was significantly longer when compared to patients with progressive disease (mOS of 15 months vs 8.4 months, respectively; p-value of 0.0112)
Updated analysis include the first 40 subjects treated with MDNA55 continues to show an impressive overall survival rate at 12 months (OS-12) of 45%, irrespective of IL4R expression, and OS-12 of 58% in patients showing a treatment response (n=32). This is an improvement of up to 150% when compared to approved therapies for rGBM (OS-12 is 18-34%).
Safety data continue to show a better safety profile when compared to previous MDNA55 trials with no systemic toxicities or drug related deaths.
"The consistent and extremely encouraging results presented by Key Opinion Leaders at the SNO conference continues to add an impressive data set for the safety and efficacy of MDNA55," added Dr. Merchant. "We look forward to presenting additional analysis and results at various conferences over the coming months."
"We now have readout from 87% of our trial population which continue to show very promising outcomes with MDNA55," added Dr. Martin Bexon, MD, Head of Clinical Development at Medicenna. "A median survival of 15 months in IL4R patients and a tumor control rate of 82% from nadir is especially promising considering that patients in this study have a worse prognosis than most due to the absence of IDH mutations, de novo GBM at initial diagnosis and ineligibility for resection, with more than half of the patients harbouring tumors with an unmethylated MGMT promoter."