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BCX17725

Phase 1

Netherton Syndrome | Small molecule | Rare Disease |BioCryst Pharmaceuticals, Inc.|Last Updated: Aug 27, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials1
Total Enrollment78

FDA Designations

No designations recorded

Clinical trial landscape

BCX17725 · 1 trial · 1 indication

Phase 1 1
NCT06539507A Study of the Safety, Tolerability, Pharmacokinetics, and Immunogenicity of BCX17725Netherton Syndrome
RECRUITING78 Analytics
PHASE1RECRUITING
A Study of the Safety, Tolerability, Pharmacokinetics, and Immunogenicity of BCX17725
Netherton SyndromeUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of treatment-emergent adverse events (TEAEs)
From screening through EOS (ie, through Day 78 in Parts 1 and 3, and Day 106 in Part 2)

Incidence of TEAEs as assessed by Common Terminology Criteria for Adverse Events (CTCAE) from screening through end-of-study (EOS) in each study part

Change from baseline in Ichthyosis Area and Severity Index (IASI) score at Week 12 (Part 4)
From baseline to Week 12

IASI measures the severity of erythema (IASI-E) and scaling (IASI-S); the maximum sub-scores for the IASI-E and IASI-S being 24, and the maximum total IASI score being 48. Higher scores indicate worse clinical outcome.

Secondary Endpoints

Maximum observed serum concentration (Cmax)
Up to Day 64 (Part 1), Day 92 (Part 2), and Day 78 (Part 3)
Time to maximum observed serum concentration (Tmax)
Up to Day 64 (Part 1), Day 92 (Part 2), and Day 78 (Part 3)
Area under the serum concentration-time curve (AUC) from time 0 to the time of last measurable concentration (AUC0-t)
Up to Day 64 (Part 1), Day 92 (Part 2), and Day 78 (Part 3)
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part 1 - BCX17725 single doseEXPERIMENTALParticipants randomized to BCX17725 will receive BCX17725 as a single dose in sequential ascending dose cohorts
Part 1 - placebo single doseEXPERIMENTALParticipants randomized to placebo will receive placebo as a single dose
Part 2 - BCX17725 multiple dosesEXPERIMENTALParticipants randomized to BCX17725 will receive BCX17725 as multiple doses in sequential ascending dose cohorts
Part 2 - placebo multiple dosesEXPERIMENTALParticipants randomized to placebo will receive placebo as multiple doses
Part 3 - BCX17725 multiple dosesEXPERIMENTALParticipants will receive BCX17725 as multiple doses
Part 4 - BCX17725 multiple dosesEXPERIMENTALParticipants will receive BCX17725 as multiple doses

Interventions

NameTypeDescription
BCX17725DRUGBCX17725 for injection
PlaceboDRUGPlacebo for injection
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Eligibility Criteria

Age Range12 Years to 65 Years
SexALL
Healthy VolunteersYes
Study Sites12

Key Inclusion Criteria: * Male or non-pregnant, non-lactating female aged 18 to 55 years, inclusive (Parts 1 and 2), 18 to 65 years, inclusive (Part 3), or 12 to 65 years, inclusive (Part 4) * Confirmed diagnosis of Netherton syndrome (Parts 3 and 4) * IGA score of ≥ 3 (Parts 3 and 4) and IASI scor...

Countries:United StatesAustraliaFranceGermanyNetherlands
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Recent Changes (Last 90 Days)

LOWAug 27, 2026NCT06539507lastUpdatePostDate: changed
LOWAug 27, 2026NCT06539507lastUpdatePostDate: changed
LOWJun 16, 2026NCT06539507lastUpdatePostDate: changed
LOWJun 16, 2026NCT06539507lastUpdatePostDate: changed
LOWJun 16, 2026NCT06539507lastUpdatePostDate: changed

Frequently asked questions about BCX17725

What is BCX17725 used for?

BCX17725 is an investigational small molecule being developed for the treatment of Netherton Syndrome, a rare genetic skin disorder. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities.

Who makes BCX17725?

BCX17725 is being developed by BioCryst Pharmaceuticals, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker symbol BCRX. The company is conducting a Phase 1 clinical trial of the drug in patients with Netherton Syndrome.

What phase is BCX17725 in?

BCX17725 is in Phase 1 clinical development. It is an investigational drug and has not been approved for any use. The ongoing Phase 1 trial is recruiting participants to evaluate the safety, tolerability, pharmacokinetics, and immunogenicity of the drug.

What clinical trials is BCX17725 in?

BCX17725 is being studied in a Phase 1 clinical trial registered as NCT06539507. This randomized, double-blind, controlled study is recruiting 78 participants with Netherton Syndrome across the United States, Australia, France, Germany, and the Netherlands. The trial includes healthy volunteers and is currently active.

How does BCX17725 work?

The specific molecular target and mechanism of action of BCX17725 have not been disclosed. It is a small molecule being developed for Netherton Syndrome, and its mechanism is under investigation in the ongoing Phase 1 clinical trial.