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S230815- Starting dose A

Phase 1

Epileptic Encephalopathy | Small molecule | Other |Tango Therapeutics, Inc.|Last Updated: May 12, 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
CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment20
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07227857A First-in-human Study of S230815 in Pediatric Participants With KCNT1-related Developmental and Epileptic EncephalopathyPHASE1 RECRUITING 20Nov 24, 2025Apr 15, 2028May 12, 202616 United States, France +3
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Study Endpoints
Primary Endpoints
Incidence and severity of Adverse Events (AE)'s.
Through End of study visit (A maximum of 116 weeks)
Secondary Endpoints
Pharmacokinetic (PK) parameters of S230815 in cerebrospinal fluid (CSF) Ctrough
Through week 96
Pharmacokinetic (PK) parameters of S230815 in plasma AUC 0-τ
Through End of study visit (A maximum of 116 weeks)
Pharmacokinetic (PK) parameters of S230815 in plasma Cmax
Through End of study visit (A maximum of 116 weeks)
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Cohort 1EXPERIMENTAL -
Cohort 2EXPERIMENTAL -
Cohort 3EXPERIMENTAL -
Cohort 4EXPERIMENTAL -
Interventions
NameTypeDescription
S230815- Starting dose ADRUGSolution for injection
S230815- Dose BDRUGSolution for injection
S230815- Dose CDRUGSolution for injection
S230815- Dose DDRUGSolution for injection
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Eligibility Criteria
Age Range2 Years — 12 Years
SexALL
Healthy VolunteersNo
Study Sites16

Inclusion Criteria: * Male or female pediatric participants aged 2-12 years old at screening, with a genetically confirmed diagnosis of Developmental Epileptic Encephalopathy (DEE) due to a pathogenic or likely pathogenic variant in KCNT1 confirmed by central genetic testing. * Stable dose of other...

Countries:United StatesFranceItalyJapanSpain
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Recent Changes (Last 90 Days)
LOWMay 24, 2026NCT07227857studyFirstPostDate: changed