Quarterly report pursuant to Section 13 or 15(d)

Nature of Business

Nature of Business
6 Months Ended
Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Nature of Business
Nature of Business

Inhibikase Therapeutics, Inc. (the “Company,” “we” or “our”) is a clinical-stage pharmaceutical company developing therapeutics for Parkinson’s Disease, or PD, and related disorders that arise inside and outside of the brain. In 2021, we commenced clinical development of IkT-148009, a small molecule Abelson Tyrosine Kinase inhibitor we believe can modify the course of Parkinson’s disease including its manifestation in the gastrointestinal tract, or GI. Results to date of our completed Phase 1 Single and Multiple Ascending Dose escalation study (SAD and MAD, respectively) in older and elderly healthy volunteers have revealed important insights into the safety, tolerability and pharmacokinetics of IkT-148009 in human subjects. Results from the 88 older and elderly healthy Phase 1 subjects have shown that IkT-148009 has a half-life of greater than 24 hours and just a 25 mg once-daily oral dose reached exposures that are consistent with the exposures to the drug that resulted in therapeutic efficacy in animal models of progressive Parkinson’s disease. In July 2021, the U.S. Food and Drug Administration ("FDA"), agreed with the Company’s plan to initiate its Phase 1b study in Parkinson’s patients which commenced dosing October 19, 2021 and was closed June 2022 after two dosing cohorts. FDA review of the Phase 1/1b data and the protocol for the follow-on Phase 2a three-month dosing study resulted in the FDA agreeing with the Company’s view that it was appropriate for the Phase 2a study to begin, prompting the Company to close the Phase 1b study after two dosing cohorts. The Phase 2a ‘201 study’ began May 23, 2022 with the opening of the first site; we have opened 11 of 40 planned sites as of August 12, 2022. 120 treatment naïve patients are planned to be enrolled in this study which will dose patients with one of three planned doses of IkT-148009 or placebo once daily for three months. In addition to primary endpoints of safety/tolerability/pharmacokinetics, a hierarchy of 15 secondary endpoints measuring drug impact on motor and non-motor features of Parkinson’s disease in the brain or GI tract will be evaluated with descriptive statistics. Patients meeting the enrollment criteria are presently being scheduled for screening visits across open sites, with clinical readouts expected sometime in the second half of 2023.

Our efforts in Parkinson’s disease are being extended into other Parkinson’s related indications, such as the orphan disease Multiple Systems Atrophy ("MSA"). Consistent with our efforts in Parkinson’s disease, our clinical pursuit of MSA depends on the outcome of animal studies modeling human MSA. In November 2020, the Company, along with its collaborators at Arizona State University, published evidence that the post-mortem MSA patient brain displayed evidence that the c-Abl kinase may play an important role in MSA, a role that mirrors the role of c-Abl in Parkinson’s. This observation prompted the initiation of two animal model studies to explore the ability of IkT-148009 to therapeutically treat MSA in animals. These model studies are ongoing and will be used to "gate" entry into clinical trials both in the U.S. and in the EU27 countries. The Company continues to prepare regulatory filings in the US and EU27 to enable the planned Phase 2 MSA trial if IkT-148009 is validated to be active in MSA in model studies. Our advancement of the pre-clinical and clinical development program for MSA has been aided by a grant from the National Institute of Neurological Diseases and Stroke, or NINDS, an Institute of the National Institutes of Health, for $385,888 to fund animal model studies of IkT-148009 as a therapy for MSA. The Phase 2a study proposed in MSA is planned as a safety and tolerability study in up to 19 sites in the EU27, and up to six sites in the U.S. involving 60 patients. Primary endpoints in safety and tolerability with secondary and exploratory endpoints in MSA efficacy parameters will be measured and assessed with descriptive statistics following-six month daily dosing at one of two doses. Execution of this trial will require the Company to raise additional working capital.

On June 29, 2022, Inhibikase filed its Investigational New Drug Application ("IND") with the FDA in preparation to initiate clinical development of IkT-001Pro, the Company's prodrug of imatinib mesylate to treat Stable-phase Chronic Myelogenous Leukemia (SP-CML). IkT-001Pro will be evaluated in a two-part dose finding/dose equivalence study in up to 62 healthy volunteers. The study is designed to evaluate the steady-state pharmacokinetics of IkT-001Pro and determine the dose of IkT-001Pro equivalent to 400 mg imatinib mesylate, the standard-of-care dose for SP-CML. Assuming FDA permits the IND to proceed, Inhibikase expects to initiate this two-part bioequivalence study in the third or fourth quarter of 2022. Following the study, Inhibikase will confer with the FDA to begin the New Drug Application ("NDA") process following the proposed approval path for IkT-001Pro und the 505(b)(2) statute. The Company will simultaneously pursue a superiority study comparing the selected does of IkT-001Pro to standard-of-care 400 mg imatinib mesylate in SP-CML patients using a novel two-period wait list crossover switching study.

In the ensuing 12 months, the Company anticipates reporting the full outcomes of its completed Phase 1/1b study of IkT-148009 in older and elderly healthy subjects and in Parkinson’s patients at the Movement Disorder Society Congress in September, 2022 reporting the outcomes of the completed chronic toxicology studies in rats and monkeys for IkT-148009 to enable chronic drug administration in Parkinson’s patients in September 2022, the initiation of the effect of food on the pharmacology of IkT-148009 and the initiation of an open-label safety extension study of IkT-148009 that would be initiated in patients who completed three-month dosing in the ‘201 study’ and possibly the initiation of a Phase 2a trial in MSA. These additional clinical studies to support clinical development of IkT-148009 will require additional capital for their completion.

Our programs utilize small molecule, oral protein kinase inhibitors to treat PD and its GI complications. We have shown in animal models of progressive PD that our lead clinical candidate, IkT-148009, is a brain penetrant Abelson tyrosine kinase, or c-Abl inhibitor, that halts disease progression and reverses functional loss in the brain and reverses neurological dysfunction in the GI tract in animal models of human disease. We have not yet observed reversal of functional loss in humans with IkT-148009. The ability to halt progression and restore function was shown in animal models of progressive disease that mimic the rate of disease progression and the extent of functional loss in the brain and/or the GI tract as found in patients with PD. We believe our therapeutic approach would be disease-modifying. Our understanding of how and why PD progresses has led us to believe that functional loss in Parkinson’s patients may be at least partially reversed although this has not been shown clinically. Based on the measurements in animal models, it is possible that patients treated with IkT-148009 may have their disease progression slowed or halted, we may see a progressive reduction in the need for symptomatic or supportive therapy and/or we may ultimately eliminate the need for symptomatic therapy. However, as of the date of this Quarterly Report on Form 10-Q ("Report"), it is unknown whether any of the outcomes seen in the animal models will occur in patients following treatment with IkT-148009.