On February 5, 2025 Pasithea Therapeutics Corp. (NASDAQ: KTTA) ("Pasithea" or the "Company"), a clinical-stage biotechnology company developing PAS-004, a next-generation macrocyclic MEK inhibitor, for the treatment of neurofibromatosis type 1 (NF1) and other cancer indications, reported that the external Safety Review Committee recommended that the Company’s Phase 1 clinical trial of PAS-004 in advanced cancer should proceed to cohort 5, 22mg capsule, without modification (Press release, Pasithea Therapeutics, FEB 5, 2025, View Source [SID1234650055]). This recommendation was based on the review of the safety data from three patients in cohort 4A (15mg capsule) and the absence of any dose limiting toxicities (DLT’s). In addition, no rash has been observed to date in any of the first 14 patients who have been dosed with PAS-004 in either capsule (12 patients) or tablet (2 patients) formulation. Rash is a common adverse event (AE) that is observed at low doses with competitor MEK inhibitors and may lead to the high discontinuation rate in real world practice.
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"As we are observing substantial exposure levels of PAS-004, we remain encouraged by the safety profile PAS-004 continues to exhibit," stated Dr. Tiago Reis Marques, Chief Executive Officer of Pasithea. "With the differentiated profile of PAS-004, we believe it is possible that this highly specific macrocyclic MEK inhibitor with a half life of greater than 60 hours may change the treatment paradigm for patients with NF1 and inoperable plexiform neurofibromas. We are looking forward to presenting updated pharmakokinetic (PK) and pharmacodynamic (PD) data during Q1 2025."
The ongoing Phase 1 clinical trial is a multi-center, open-label, dose escalation 3+3 study design to evaluate the safety, tolerability, pharmacokinetic (PK), pharmacodynamic (PD), and preliminary efficacy of PAS-004 in patients with MAPK pathway driven advanced solid tumors with a documented RAS, NF1 or RAF mutation or patients who have failed BRAF/MEK inhibition (NCT06299839).