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JZP815

Phase 1

Advanced Cancer | Small molecule | Oncology |Jazz Pharmaceuticals plc|Trials Updated: Sep 10, 2026

JZP815 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Sep 2022

JZP815 target and mechanism

Molecular targetRAF
Target classKinase
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment98

FDA Designations

No designations recorded

JZP815 clinical trials

JZP815 · 1 trial · 7 indications

Phase 1 1
NCT05557045A Study of JZP815 Oral Capsules in Adult Participants With Advanced or Metastatic Solid Tumors Harboring Mitogen Activated Protein Kinase (MAPK) Pathway Alterations to Investigate the Safety, Dosing, and Antitumor Activity of JZP815Advanced Cancer
ACTIVE NOT_RECRUITING98 Analytics
PHASE1ACTIVE NOT_RECRUITING
A Study of JZP815 Oral Capsules in Adult Participants With Advanced or Metastatic Solid Tumors Harboring Mitogen Activated Protein Kinase (MAPK) Pathway Alterations to Investigate the Safety, Dosing, and Antitumor Activity of JZP815
Advanced CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Dose-Limiting Toxicities (Part A)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Number of Participants With Treatment-emergent Adverse Events and Serious Adverse Events (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Hemoglobin (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Absolute Neutrophil Count (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Platelets (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Hematocrit (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Aspartate Aminotransferase (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Alanine Aminotransferase (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Creatinine (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Total Bilirubin (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Heart Rate (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Change From Baseline in Blood Pressure (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Number of Participants With Dose Interruptions and Reductions (Part A and B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Objective Response Rate (as Defined by RECIST v1.1) (Part B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention
Duration of Response (Part B)
Baseline until death, withdrawal of consent, or lost to follow-up, up to 18 months after last participant starts study intervention

Secondary Endpoints

Pharmacokinetic Parameter Maximum Plasma Concentration (Cmax) Levels of JZP815 and its Metabolites (Part A)
MTD determination cohorts, Cycle 1 Days 1 and 15: predose and 0.25,0.5,1,2,3,4,6, 8 hours (hr) postdose; 24, 48 and 72 hr postdose relative to 1st dose given on Cycle 1 Day 1; Others, Cycle 1 Days 1, 15 or 22: predose and 0.25,0.5,1,2,3,4,6,8 hr postdose
Pharmacokinetic Parameter Time to Maximum Plasma Concentration (Tmax) of JZP815 and its Metabolites (Part A)
MTD determination cohorts, Cycle 1 Days 1 and 15: predose and 0.25,0.5,1,2,3,4,6, 8 hours (hr) postdose; 24, 48 and 72 hr postdose relative to 1st dose given on Cycle 1 Day 1; Others, Cycle 1 Days 1, 15 or 22: predose and 0.25,0.5,1,2,3,4,6,8 hr postdose
Pharmacokinetic Parameter Area Under the Concentration-Time Curve (AUC) of JZP815 and its Metabolites (Part A)
MTD determination cohorts, Cycle 1 Days 1 and 15: predose and 0.25,0.5,1,2,3,4,6, 8 hours (hr) postdose; 24, 48 and 72 hr postdose relative to 1st dose given on Cycle 1 Day 1; Others, Cycle 1 Days 1, 15 or 22: predose and 0.25,0.5,1,2,3,4,6,8 hr postdose
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Dose Exploration (Part A): JZP815EXPERIMENTALParticipants will receive JZP815 with a starting dose of 20 mg twice daily (BID).
Expansion (Part B): JZP815EXPERIMENTALParticipants with advanced or metastatic solid tumors who will receive JZP815 at the RP2D established in Dose Exploration (Part A).

Interventions

NameTypeDescription
JZP815DRUGJZP815 will be administered as oral capsules to participants BID approximately 12 hours apart, in the morning and in the evening. QD dosing may also be investigated, if supported by PK data.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites15

Inclusion Criteria: * Participant must be ≥ 18 years of age, at the time of signing the informed consent * Participants who have histological or cytological diagnosis of an advanced or metastatic solid tumor carrying a documented, clinically significant, MAPK pathway alteration * Participants must ...

Countries:United States
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Competitive Landscape -Cancer 7 trials (matched to "Advanced Cancer")

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Recent Changes (Last 90 Days)

HIGHSep 10, 2026NCT05557045Status: RECRUITING → ACTIVE_NOT_RECRUITING
HIGHSep 10, 2026NCT05557045Status: RECRUITING → ACTIVE_NOT_RECRUITING

Frequently asked questions about JZP815

What is JZP815 used for?

JZP815 is an investigational oral therapy being studied in adults with advanced or metastatic solid tumors that harbor mitogen activated protein kinase (MAPK) pathway alterations. Tumor types under study include melanoma, non-small cell lung cancer, colorectal cancer, and anaplastic thyroid cancer. It is not approved for any use and remains in clinical development.

What does JZP815 target?

JZP815 targets RAF, a kinase in the MAPK signaling pathway. RAF kinases drive the MAPK pathway, which is frequently altered in solid tumors, and JZP815 is designed to act on tumors harboring those MAPK pathway alterations. The Phase 1 study enrolls participants selected for such alterations.

Who is developing JZP815?

JZP815 is being developed by Jazz Pharmaceuticals plc, which trades on the Nasdaq under the ticker JAZZ. Jazz Pharmaceuticals is the sponsor of the clinical program evaluating the drug in advanced solid tumors.

What phase is JZP815 in?

JZP815 is in Phase 1 clinical development. It is an investigational small molecule and has not been approved by the FDA or any other regulatory agency. The single Phase 1 trial is currently active but not recruiting, with a planned enrollment of 98 participants.

What clinical trials is JZP815 in?

JZP815 is being evaluated in one Phase 1 trial, NCT05557045, titled a study of JZP815 oral capsules in adult participants with advanced or metastatic solid tumors harboring MAPK pathway alterations. The trial is active but not recruiting, is controlled, is not randomized or double blinded, and is being conducted in the United States.

Who can enroll in the JZP815 clinical trial?

NCT05557045 enrolls adults 18 years and older of any sex with advanced or metastatic solid tumors that harbor MAPK pathway alterations, including melanoma, non-small cell lung cancer, colorectal cancer, and anaplastic thyroid cancer. Healthy volunteers are not eligible. The study is biomarker selected and is being run at sites in the United States.