On June 24, 2022 Priothera, a late-clinical stage biotechnology company pioneering the development of its S1P receptor modulator compound, mocravimod, reported that first clinical data on mocravimod (also known as KRP203) in hematological malignancies patients undergoing allogeneic hematopoietic stem cell transplant (HSCT) at the European Hematology Association (EHA) (Free EHA Whitepaper) 2022 Congress, which was held in Vienna, Austria, June 9-12th, 2022 (Press release, Priothera, JUN 24, 2022, View Source [SID1234616246]).

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The oral presentation, which took place on 12th June, was entitled A two-part, single- and two-arm randomized, open-label study to evaluate the safety, tolerability and pharmacokinetics of KRP203 in subjects with hematological malignancies undergoing allogeneic hematopoietic stem cell transplantation. The study showed that in the Phase 1b/2a study mocravimod was safe and well tolerated with promising overall survival.

Key take aways from the data presentation were:

The study provided first ever human data of a S1P receptor modulator administered to patients undergoing allogeneic HSCT
S1PR modulator class effects, such as bradycardia, were of no clinical concern
Promising overall survival (OS) data
Limited number of relapses, acute and chronic graft-versus-host disease (GVHD)
Data supportive for conducting the planned MO-TRANS pivotal study to investigate efficacy (Relapse-free survival and OS) and GVHD in AML patients undergoing allogeneic HSCT
Priothera is initiating the pivotal MO-TRANS global Phase 2b/3 study in Europe, US and Japan, to assess the efficacy and safety of mocravimod as an adjunctive and maintenance therapy in adult AML patients undergoing allogeneic HSCT. The study is expected to start in the second half of 2022 and preliminary data from this study are expected by the end of 2024.

Florent Gros, Co-Founder and CEO of Priothera, said: "We are delighted to have been given the opportunity to present the full first human clinical data on mocravimod at the European Hematology Association (EHA) (Free EHA Whitepaper) Congress this year. Based on these results mocravimod has the potential to be a first-in-class therapy in maintaining graft-versus-leukemia responses while preventing graft-versus-host disease. This novel approach would provide a tremendous benefit to AML patients undergoing an allogeneic hematopoietic stem cell transplant. We are excited about mocravimod which leverages a well-described mode of action in a hematology/oncology setting and has been successfully used in autoimmune indications. Pre-clinical and clinical proof of concept studies have herewith demonstrated mocravimod’s ability to improve survival outcomes for this devastating disease. We look forward to advancing the global pivotal Phase 2/3 trial which is due to start in the second half of 2022."

Priothera’s abstract is available on EHA (Free EHA Whitepaper)2022 Congress Abstract Book, here: View Source

About Mocravimod
Mocravimod (also known as KRP203) is a synthetic, sphingosine 1-phosphate receptor (S1PR) modulator. This novel investigational drug has been assessed in Phase 1 and Phase 2 trials for safety and tolerability, as well as for efficacy in several autoimmune indications. Promising data from a Phase 1b/2a clinical study in patients with hematological malignancies led Priothera to further develop mocravimod for the treatment of blood cancers and the improvement of CART cell therapy.

Mocravimod will be investigated as an adjunctive and maintenance treatment in a Phase 2b/3 study as a potential treatment for patients with Acute Myeloid Leukemia (AML) receiving allogeneic hematopoietic stem cell transplantation (HSCT). Allogeneic HSCT is the only potentially curative approach for AML patients, but current treatments have unacceptably high mortality and morbidity rates.

Priothera leverages S1PR modulator’s unique mode of action to maintain anti-leukemia activity – graft-versus leukemia (GVL) while reducing tissue damage resulting from graft-versus-host disease (GVHD), a consequence of allogeneic HSCT. This novel treatment approach – mocravimod being the only S1PR modulator treating blood cancers – tackles a high unmet medical need and intends to add quality life to patients.