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BT8009

Phase 1

Urinary Bladder Neoplasm | Small molecule | Oncology |Bicycle Therapeutics plc|Last Updated: Nov 14, 2025

Target and mechanism

Molecular targetNectin-4
Target classTumor Antigen
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment329

FDA Designations

No designations recorded

Clinical trial landscape

BT8009 · 1 trial · 8 indications

Phase 1 1
NCT04561362Study BT8009-100 in Subjects With Nectin-4 Expressing Advanced MalignanciesUrinary Bladder Neoplasm
ACTIVE NOT_RECRUITING329 Analytics
PHASE1ACTIVE NOT_RECRUITING
Study BT8009-100 in Subjects With Nectin-4 Expressing Advanced Malignancies
Urinary Bladder NeoplasmUnlock trial analytics

Study Endpoints

Primary Endpoints

Parts A-1, A-2 and C: Number of participants with treatment emergent adverse events, receiving BT8009 as a monotherapy or in combination with pembrolizumab to assess safety and tolerability.
From cycle 1 day 1 until 30 days after the end of treatment or approximately 1 year

Safety reported as incidence of treatment-emergent adverse events using CTCAE v5.0 criteria.

Parts A-1 and A-2 (escalations): Number of participants with dose limiting toxicities on BT8009 as a monotherapy or in combination with pembrolizumab
28 days (for cycles that are either 21 or 28 days in length depending on dosing schedule assigned)

Number of patients who experience dose limiting toxicities BT8009 when given as a monotherapy or in combination with pembrolizumab.

Part B1-B7: Objective response rate (ORR) to assess the clinical activity of BT8009 as a monotherapy or in combination with pembrolizumab using RECIST 1.1.
Every 8 weeks for 12 months then every 12 weeks thereafter until disease progression or, death, or up to three years

Proportion of participants with confirmed complete response or partial response to BT8009 as a monotherapy or in combination with pembrolizumab according to RECIST 1.1 criteria.

Part D: Maximum plasma concentration (Cmax) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy
From Cycle 1 Day 1 through end of treatment or for up to 1 year

Plasma concentrations of BT8009 and MMAE from all participants taking BT8009 alone.

Part D: Minimum plasma concentration (Cmin) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy
From Cycle 1 Day 1 through end of treatment or for up to 1 year

Plasma concentrations of BT8009 and MMAE from all participants taking BT8009 alone

Part D: Area under the plasma concentration-time curve (AUC) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy
From Cycle 1 Day 1 through end of treatment or for up to 1 year

Plasma concentrations of BT8009 and MMAE from all participants taking BT8009 alone.

Part D: Elimination half-life (t1/2) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy
From Cycle 1 Day 1 through end of treatment or for up to 1 year

Plasma concentrations of BT8009 and MMAE from all participants taking BT8009 alone.

PartsB-8, B-9: Number of participants with treatment emergent adverse events receiving an alternative dosing regimen of BT8009 monotherapy to assess safety and tolerability.
From cycle 1 day 1 until at least 30 days after the end of treatment (each cycle is 21 days)

Number of participants with advanced solid tumor malignancies associated with Nectin-4 expression receiving an alternative dose regimen of BT8009 as a monotherapy who experience treatment-emergent adverse events using CTCAE v5.0 criteria.

Secondary Endpoints

Parts B-1-B-7: Number of participants with treatment emergent adverse events receiving BT8009 as a monotherapy or in combination with pembrolizumab to assess safety and tolerability.
From cycle 1 day 1 until at least 30 days after the end of treatment (each cycle is 21 or 28 days depending on the assigned dosing schedule)
Part B: Duration of Response time to assess preliminary anti-tumor activity of BT8009 as a monotherapy or in combination with pembrolizumab
Every 8 weeks for 12 months then every 12 weeks thereafter until disease progression or, death, or up to three years
Part B: Clinical benefit rate to assess the clinical activity of BT8009 as a monotherapy or in combination with pembrolizumab
Every 8 weeks Parts A-1, A-2, and C) and every 9 weeks (cohorts B-8 and B-9) for 12 months then every 12 weeks thereafter until disease progression or death or up to 3 years
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A-1 -BT8009 Monotherapy Dose EscalationEXPERIMENTALParticipants will receive escalating doses of BT8009.
Part A-2 -BT8009 in Combination with Pembrolizumab Dose De-EscalationEXPERIMENTALParticipants will receive BT8009 and a standard dose of pembrolizumab.
Cohort B-1 - BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009.
Cohort B-2- BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009.
Cohort B-3- BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009. .
Cohort B-4- BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009.
Cohort B-5- BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009.
Cohort B-6- BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009.
Cohort B-7- BT8009 in Combination with Pembrolizumab Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009 and standard dose of pembrolizumab.
Part C - Renal Insufficiency BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009.
Part D - BT8009 Monotherapy Supplementary PKEXPERIMENTALParticipants will receive a selected dose of BT8009.
Part B-8 - BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009.
Part B-9 - BT8009 Monotherapy Dose ExpansionEXPERIMENTALParticipants will receive a selected dose of BT8009.

Interventions

NameTypeDescription
BT8009DRUGBicyclic Toxin Conjugate (BTC) administered either weekly (i.e., on Days 1, 8, 15, and 22) or biweekly (Days 1 and 15) on a 28-day cycle or on Days 1 and 8 of a 21-day cycle for participants in A-1. Participants in Cohorts A-2 and B-7 will receive BT8009 weekly on 21-day cycle. Participants in Parts B-1-B-6 will receive BT8009 weekly either on a 21-day or 28-day cycle. Participants in Parts B-8 and B-9 will receive BT8009 on Days 1 and 8 of a 21-day cycle. Participants in Cohort C will receive BT8009 once weekly (i.e., on Days 1, 8, 15, and 22) on a 28-day cycle. Participants in Part D will receive BT8009 once weekly on a 28-day cycle.
PembrolizumabDRUGParticipants in Cohorts A-2 and B-7 will receive 200 mg IV over 30-minute infusion of pembrolizumab on Day 1 of each Q3W.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites24

Key Inclusion Criteria * Life expectancy ≥12 weeks. * Patients must have measurable disease per RECIST 1.1. * Part A-1 cohorts: * Must have exhausted all standard treatment options, including appropriate targeted therapies; or patients for which no standard therapy is considered appropriate * Patie...

Countries:United StatesCanadaFranceItalySpainUnited Kingdom
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Frequently asked questions about BT8009

What is BT8009 used for?

BT8009 is an investigational small molecule being studied for the treatment of urinary bladder neoplasm, also known as bladder cancer. It is currently in Phase 1 clinical development for this indication.

What does BT8009 target?

BT8009 targets Nectin-4, a tumor antigen. It is designed to bind to Nectin-4, which is expressed on the surface of certain cancer cells, as part of its mechanism of action in treating advanced malignancies.

Who makes BT8009?

BT8009 is being developed by Bicycle Therapeutics plc, a biopharmaceutical company. The company's stock is traded under the ticker symbol BCYC.

What phase is BT8009 in?

BT8009 is in Phase 1 clinical development. It is an investigational drug and has not yet been approved by regulatory authorities. The drug is being evaluated in an active Phase 1 clinical trial.

What clinical trials is BT8009 in?

BT8009 is being studied in a Phase 1 clinical trial with the identifier NCT04561362. This trial, titled 'Study BT8009-100 in Subjects With Nectin-4 Expressing Advanced Malignancies,' is active but not recruiting participants and has an enrollment of 329.

Is BT8009 the same as any other drug?

BT8009 is not known by any alternative names. It is a distinct investigational compound developed by Bicycle Therapeutics for the treatment of Nectin-4 expressing cancers, including bladder cancer.