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Napazimone

Phase 2

Mitochondrial Diseases | Small molecule | Other |Pharming Group N.V.|Last Updated: Apr 7, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
UNCONTROLLEDBiomarker
Total Trials1
Total Enrollment140
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07514338Open Label Extension to Assess Long Term Safety and Efficacy of KL1333 in Patients With Primary Mitochondrial DiseasePHASE2 NOT YET_RECRUITING 140Jun 9, 2026Mar 31, 2029Apr 7, 2026 -
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Study Endpoints
Primary Endpoints
Adverse events
Through study at least for 48 weeks

Number of adverse events will be monitored throughout the study for all subjects

Physical examination
At Baseline Week 0, Week 4, Week 24 and Week 48

The following parameters and body systems will be examined and any abnormalities described: height and weight; general appearance; skin; head, ears, eyes, nose, and throat; lungs; heart; lower extremity examination; abdomen; neurologic and lymph nodes. Any clinically significant changes from baseline should be recorded as AEs.

Vital signs
At Baseline Week 0, Week 4, Week 24 and Week 48

Body temperature, systolic and diastolic cuff blood pressure, pulse rate and pulse oximetry will be measured and any clinically significant changes from baseline should be recorded as AEs.

Electrocardiogram
At Baseline Week 0, Week 4, Week 24 and Week 48

Changes from baseline of ECG parameters will be evaluated.

Safety laboratory - blood chemistry
At Baseline Week 0, Week 4, Week 24 and Week 48

Monitoring of the clinically significant laboratory results for sodium, potassium, chloride, bicarbonate/carbon dioxide;, blood urea nitrogen, serum creatinine, glucose, albumin, total protein, alkaline phosphatase, aspartate aminotransferase, alanine aminotransferase, total bilirubin, direct bilirubin, indirect bilirubin, calcium, gamma-glutamyl transferase, creatine kinase

Safety laboratory - urinalysis
At Baseline Week 0, Week 4, Week 24 and Week 48

Monitoring of the clinically significant laboratory results for specific gravity, pH, semi-quantitative "dipstick" evaluation of glucose, protein, bilirubin, ketones, leukocytes, blood microscopy and/or culture to be performed if clinically indicated or if urinalysis results positive.

Safety laboratory - hematology
At Baseline Week 0, Week 4, Week 24 and Week 48

Monitoring of the clinically significant laboratory results for Hemoglobin, hematocrit, white blood cell with differentials (monocytes, eosinophils, basophils, neutrophils, lymphocytes) as an absolute value, red blood cell count, platelet count, C-reactive protein

Occurence of metabolic decompensation and lactic acidosis or image-verified stroke-like episodes consequent to GI AE and AESIs
Through study at least for 48 weeks

These events will be monitored throughout the study.

Columbia Suicide Severity Rating Scale (C-SSRS)
At Baseline Week 0

C-SSRS assesses suicidal ideation and behavior risk through a series of questions to assess for suicidal ideation and behavior, the severity and immediacy of the risk, and the level of support the subject may need. C-SSRS Severity of Ideation scores of 4 or 5 are considered SAEs.

Secondary Endpoints
Patient-reported mitochondrial fatigue
Through study at least for 48 weeks
Functional outcome
At Baseline Week 0, Week 4, Week 24 and Week 48
Patient-reported lower extremity function
At Baseline Week 0, Week 4, Week 12, Week 24, Week 36 and Week 48
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Open label extensionEXPERIMENTALSubjects will receive medication twice a day for 48 weeks minimum
Interventions
NameTypeDescription
NapazimoneDRUGProduct: KL1333 (international nonproprietary name: napazimone) Dose: Each subject will be up-titrated to his/her maximum well tolerated dose. The starting dose will be 25 mg KL1333 twice daily (BID; total daily dose of 50 mg). If KL1333 is considered to be well tolerated after 4 weeks of treatment, the dose will be increased to 50 mg KL1333 BID (total daily dose of 100 mg). The dose may be lowered from 50 mg BID to 25 mg BID at the investigator's discretion throughout the study in case of tolerability issues. Frequency: Twice daily Route: Oral
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo

Inclusion Criteria: * Completed the FALCON study (age 18 years or older), and in the opinion of the investigator and sponsor has been compliant with the study requirements * Willingness and ability to attend study appointments within the specified time windows * Willingness and ability to complete ...

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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07514338primaryCompletionDate: changed
LOWMay 24, 2026NCT07514338studyFirstPostDate: changed