On July 8, 2022 Moleculin Biotech, Inc., (Nasdaq: MBRX) ("Moleculin" or the "Company"), a clinical stage pharmaceutical company with a broad portfolio of drug candidates targeting highly resistant tumors and viruses, reported preliminary results from the second cohort of the Company’s first-in-human Phase 1a study of WP1122 (Press release, Moleculin, JUL 8, 2022, View Source [SID1234616561]). This cohort consisted of 8 subjects dosed with 16 mg/kg or placebo in the dose escalation trial evaluating the safety and pharmacokinetics (PK) of WP1122 in healthy volunteers in the United Kingdom (UK). Based on the overall results in Cohort 2, the Company deemed the cohort dose safe and well-tolerated and began its SAD Cohort 3 with a dose escalation to 32 mg/kg.
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The Phase 1a, first-in-human, randomized, double-blind, placebo-controlled, overlapping SAD and MAD is investigating the effects of WP1122 administered as an oral solution in healthy human volunteers. It is the first step in a planned investigation of WP1122 for the treatment of COVID-19. Dose escalation will take place in sequential SAD cohorts, and MAD will start as soon as SAD has successfully completed at least 3 dosing cohorts. This study in healthy volunteers will explore safety and PK, and subsequent antiviral clinical development is expected to be in patients infected with SARS-CoV-2 to further evaluate safety and establish a favorable risk/benefit profile. The Company expects to enroll approximately 80 subjects in this trial.
Walter Klemp, Chairman and Chief Executive Officer of Moleculin commented, "We continue to be encouraged by the safety data demonstrated by WP1122 in the SAD portion of our first-in-human Phase 1a study of WP1122. With two of the SAD cohorts now completed with promising preliminary results, we are working to enroll and complete Cohort 3 at 32 mg/kg in order to proceed to the MAD phase of the trial toward establishing a maximum tolerated dose. To date, WP1122 has demonstrated no dose escalating stopping criteria, and we look forward to taking the next step in studying the potential of WP1122 for the treatment of certain viral diseases, including COVID-19, and cancers."
During the SAD portion of this study, dose escalation will proceed up to a maximum dose of 64 mg/kg as a single dose. Dosing of WP1122 began in SAD at 8 mg/kg as a single dose and has escalated in two-fold increments (i.e., to 16 and now to 32 mg/kg as single doses, etc.) in subsequent cohorts. Dosing of WP1122 in the MAD cohorts will start after a dose of 32 mg/kg has been shown to be safe in the single dose cohort. The first dose administered in MAD will be 16 mg/kg every 12 hours (32 mg/kg/day) for 7 days and dosing in the second MAD cohort will escalate to 32 mg/kg every 12 hours (64 mg/kg/day) for 7 days.
For more information about the study, please visit clinicaltrials.gov and reference identifier NCT05195723. Moleculin is also in the process of identifying additional countries where potential future Phase 2 COVID-19 clinical studies could occur.
About WP1122
WP1122 was developed as a 2-DG prodrug to provide a more favorable pharmacological profile and was found to have greater potency than 2-DG alone in preclinical models where tumor cells require higher glycolytic activity than normal cells. WP1122 has also been shown to have a greater antiviral effect than 2-DG against SARS-CoV-2 in MRC-5 cells in culture. The improved pharmacokinetic and pharmacodynamic (PK/PD) profile of WP1122 compared to 2-DG was noted in female mice following oral dosing at equimolar (i.e., equivalent levels of 2-DG) doses.
While the Company is in the process of identifying additional countries where potential future Phase 2 COVID-19 clinical studies might occur, the volatility and unpredictability of COVID-19 incidence in various countries may limit the ability to recruit certain subjects and could make it infeasible to conduct a Phase 2 clinical trial in a given country. Additionally, Moleculin recently received IND clearance from the U.S. Food and Drug Administration (FDA) to initiate a Phase 1 study of WP1122 for the treatment of Glioblastoma Multiforme (GBM). The Company is seeking collaborators with the intent to commence clinical trials of WP1122 in cancer indications including GBM, pancreatic cancer and others.