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PAS-004

Phase 1

NF1 Mutation | Small molecule | Oncology |Pasithea Therapeutics Corp.|Last Updated: Dec 4, 2025

Target and mechanism

Molecular targetMEK
Target classKinase
ModalitySmall molecule

Also known as PAS-004 Capsules, PAS-004 Tablets

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment56

FDA Designations

FAST_TRACKRARE_PEDIATRIC_DISEASEORPHAN_DRUG

Clinical trial landscape

PAS-004 · 2 trials · 8 indications

Phase 1 2
NCT06961565PAS-004 in Adults Who Have Neurofibromatosis Type 1 With Plexiform NeurofibromasNF1 Mutation
RECRUITING56 Analytics
NCT06299839PAS-004 in Patients With Advanced Solid TumorsRAS Mutation
RECRUITING48 Analytics
PHASE1RECRUITING
PAS-004 in Adults Who Have Neurofibromatosis Type 1 With Plexiform Neurofibromas
NF1 MutationUnlock trial analytics
PHASE1RECRUITING
PAS-004 in Patients With Advanced Solid Tumors
RAS MutationUnlock trial analytics

Study Endpoints

Primary Endpoints

Part A: To evaluate the safety and tolerability of PAS-004 when administered for one 28-day treatment cycle
Part A from enrollment (Day 1) through Day 28 (completion of Cycle 1)

Endpoint/Outcome Measures: Number of participants with dose-limiting toxicities (DLTs), with Adverse Events (AEs), AEs leading to interruption or discontinuation of study drug, with clinically significant findings on clinical laboratory tests, with abnormal cardiac and visual function exams using the Common Terminology Criteria for Adverse Events (CTCAE Version 5).

Part B: To evaluate the safety and tolerability of PAS-004 when administered for six 28-day treatment cycle
Part B from enrollment (Day 1) through Day 168 (completion of Cycle 6) [each cycle is 28 days]

Endpoint/Outcome Measures: Number of participants with dose-limiting toxicities (DLTs), with Adverse Events (AEs), AEs leading to interruption or discontinuation of study drug, with clinically significant findings on clinical laboratory tests, with abnormal cardiac and visual function exams using the Common Terminology Criteria for Adverse Events (CTCAE Version 5).

Evaluation of dose limiting toxicities (DLTs)
Day 1 through Day 35 (Cycle 1)

Pre-defined DLTs will be assessed for dose escalation and expansion determinations.

Evaluation of adverse events (AEs)
Screening through Day 1 through Day 35 (Cycle 1), and 30 days after discontinuation of study drug

The number and severity of AEs will be evaluated for dosing cohorts to inform dose escalation and expansion decisions, and support selection of a preliminary recommended phase 2 dose (RP2D).

Evaluation of AEs leading to discontinuation of investigational product (IP), PAS-004.
Screening through Day 1 through Day 35 (Cycle 1), and 30 days after discontinuation of study drug

The number and severity of AEs leading to discontinuation of study drug will be evaluated for dosing cohorts to inform dose escalation and expansion decisions, and support selection of a preliminary recommended phase 2 dose (RP2D).

Evaluation of hematology laboratory parameters
Screening through Day 1 through Day 35 (Cycle 1), and 30 days after discontinuation of study drug

Lab parameters will be evaluated for to assess the safety profile of the study drug, and support selection of a preliminary recommended phase 2 dose (RP2D).

Evaluation of clinical chemistry laboratory parameters
Screening through Day 1 through Day 35 (Cycle 1), and 30 days after discontinuation of study drug

Lab parameters will be evaluated for to assess the safety profile of the study drug, and support selection of a preliminary recommended phase 2 dose (RP2D).

Secondary Endpoints

Peak Plasma Concentration (Cmax)
Day 28 (predose, and 1 , 3 , 6 , and 24 hours post-dose) [end of Cycle 1]
Plasma predose or trough concentration (Ctau/Ctrough)
Day 28 (predose, and 1 , 3 , 6 , and 24 hours post-dose) [end of Cycle 1]
Time of maximum plasma concentration (Tmax)
Day 28 (predose, and 1 , 3 , 6 , and 24 hours post-dose) [end of Cycle 1]
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part AEXPERIMENTALSequential dose escalation: 4 mg, 8 mg, 12 mg, and 18 mg
Part BEXPERIMENTALTwo parallel cohorts dosing at 2 levels selected based on Part A safety results
PAS-004 CapsulesEXPERIMENTALSequential dose escalation: 2 mg, 4 mg, 8 mg, 15 mg, 22 mg, 30 mg, 37 mg, and 45 mg
PAS-004 TabletsEXPERIMENTALA single cohort at the 4mg dose using tablet formulation of PAS-004

Interventions

NameTypeDescription
PAS-004 TabletsDRUGA mitogen-activated protein kinase/extracellular signal-regulated kinase kinase (MAPK/ERK kinase, or MEK) 1/2 inhibitor presented in 1m and 4mg strength tablets, intended for oral administration once daily.
PAS-004 CapsulesDRUGA mitogen-activated protein kinase/extracellular signal-regulated kinase kinase (MAPK/ERK kinase, or MEK) 1/2 inhibitor presented in 1 mg, 4mg, and 10 mg strength capsules, intended for oral administration once daily.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites5

Inclusion Criteria: 1. Participant is capable of providing informed consent, which includes compliance with the requirements, prohibitions and restrictions listed in the informed consent form. 2. Participant has been informed both verbally and in writing about the objectives of the clinical study, ...

Countries:United StatesAustraliaSouth KoreaBulgariaRomania
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Competitive Landscape -Genetic Mutations 6 trials (matched to "NF1 Mutation")

Frequently asked questions about PAS-004

What is PAS-004 used for?

PAS-004 is an investigational small molecule being developed for oncology indications involving NF1 and RAS mutations. It is being studied in patients with advanced solid tumors that have RAS, NF1, or RAF mutations, and in adults with neurofibromatosis type 1 who have plexiform neurofibromas. It is currently in Phase 1 clinical development.

What does PAS-004 target?

PAS-004 targets MEK, a kinase enzyme in the RAS/MAPK signaling pathway. By inhibiting MEK, PAS-004 is designed to interfere with signaling that drives tumor growth in cancers with RAS or NF1 mutations. This mechanism is relevant to the Phase 1 trials evaluating PAS-004 in advanced solid tumors and NF1-related plexiform neurofibromas.

Who makes PAS-004?

PAS-004 is being developed by Pasithea Therapeutics Corp., a biopharmaceutical company traded on Nasdaq under the ticker symbol KTTA. The company is conducting Phase 1 clinical trials of PAS-004 in patients with advanced solid tumors and in adults with neurofibromatosis type 1 and plexiform neurofibromas.

What phase is PAS-004 in?

PAS-004 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA. The FDA has granted PAS-004 Fast Track designation, Orphan Drug designation, and Rare Pediatric Disease designation for its intended indications.

What clinical trials is PAS-004 in?

PAS-004 is being studied in two Phase 1 trials. NCT06299839 is evaluating PAS-004 in patients with advanced solid tumors with RAS, NF1, or RAF mutations, enrolling 48 participants in the United States, Bulgaria, and Romania. NCT06961565 is studying PAS-004 in adults with neurofibromatosis type 1 and plexiform neurofibromas, enrolling 56 participants in the United States, Australia, and South Korea.

Is PAS-004 the same as PAS-004 Capsules or PAS-004 Tablets?

Yes, PAS-004 Capsules and PAS-004 Tablets are alternative names for the same drug, PAS-004. The drug is being developed in oral formulations for the treatment of cancers and conditions associated with NF1 and RAS mutations.