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Active, Not Recruiting

NCT Number: NCT04561362

Study BT8009-100 in Subjects With Nectin-4 Expressing Advanced Malignancies

This study is a Phase I/II, multicenter, first-in-human, open-label dose-escalation study of BT8009 given as a single agent and in combination with pembrolizumab in participants with advanced solid tumors associated with Nectin-4 expression or in participants with advanced solid tumor malignancies having renal insufficiency. The primary endpoints are: Dose limiting toxicities (Parts A-1 and A-2), Overall response rate per RECIST v1.1 (Parts B1-B7), Safety and tolerability (Parts B-8, B-9 and C), and characterization of the pharmacokinetics (Part D).

Active, Not Recruiting

This study is active but is not currently recruiting participants.

Key information

Conditions

Urinary Bladder Neoplasm Adnexal Diseases Advanced Solid Tumor Breast Diseases Breast Neoplasms Endocrine Gland Neoplasms Endocrine System Diseases Female Urogenital Diseases Female Urogenital Diseases and Pregnancy Complications Genital Diseases Genital Diseases, Female Genital Neoplasms, Female Gonadal Disorders Hormone Receptor Positive, HER2-low Neoplasms Hormone Receptor Positive, HER2-negative Neoplasms Kidney Diseases Male Urogenital Diseases Neoplasms Neoplasms by Site Non-Small-Cell Lung Neoplasms Ovarian Diseases Ovarian Neoplasm Ovarian Neoplasms Renal Insufficiency Skin Diseases Skin and Connective Tissue Diseases Triple Negative Breast Neoplasms Urinary Bladder Diseases Urinary Bladder Neoplasms Urogenital Diseases Urogenital Neoplasms Urologic Diseases Urologic Neoplasms

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1 / Phase 2

Primary location

University Health Network, Princess Margaret Cancer Centre, Toronto, Ontario, Canada

Loading trial locations.

About this study

This study will assess the safety and tolerability of BT8009 alone and in combination with pembrolizumab in patients with select advanced solid tumors. BT8009 will be given as a single agent in 3 different dosing schedules- weekly (28 day cycle), biweekly (28 day cycle) or dosing on day 1 and day 8 of a 3-weekly (21 day cycle) and in combination with pembrolizumab. There are four parts to this study. Part A is a dose escalation in patients with select advanced solid tumors primarily designed to evaluate safety and tolerability of BT8009 as monotherapy or in combination with pembrolizumab and to determine a recommended Phase II dose (RP2D). Following a selection of an RP2D, Part B, a dose expansion portion, will be initiated with the primary objective of clinical activity of BT8009 as a monotherapy or in combination with pembrolizumab in patients with select advanced solid tumors. Additionally Parts B-8 and B-9 will evaluate the safety and tolerability of an alternate dose and schedule of BT8009 monotherapy. Part C will evaluate safety and tolerability of RP2D in patients with renal insufficiency. Part D will further characterize the pharmacokinetics of BT8009 and MMAE.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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
  • Patients with advanced, histologically confirmed urothelial (transitional cell) carcinoma that recurred after or has been refractory to prior therapy (fresh tumor biopsy or an archived sample must be submitted); or
  • Patients with advanced, histologically confirmed pancreatic, breast, non-small-cell lung cancer (NSCLC), gastric, esophageal, head and neck, or ovarian tumors that recurred after or has been refractory to prior therapy (fresh tumor biopsy or an archived sample testing for Nectin-4 expression).
  • Part A-2:
  • Must have exhausted all standard treatment options, including appropriate targeted therapies; or patients for which no standard therapy is considered appropriate
  • Patients with advanced, histologically confirmed urothelial (transitional cell) carcinoma that have progressed following prior therapy
  • Cohort B-1: Histologically documented urothelial carcinoma, previously treated with enfortumab vedotin (EV). Patients with resectable, locally advanced urothelial carcinoma are ineligible. Must have had progression or recurrence of urothelial cancer during or following receipt of most recent therapy.
  • Cohort B-2 and B-3: Histologically documented urothelial carcinoma, not previously treated with enfortumab vedotin (EV). Patients with resectable, locally advanced urothelial carcinoma are ineligible. Must have had progression or recurrence of urothelial cancer during or following receipt of most recent therapy.
  • Cohort B-4: Patients with histologically confirmed non-mucinous epithelial ovarian, fallopian tube, or primary peritoneal cancer that is Stage III or IV according to the International Federation of Gynecology and Obstetrics (FIGO) or tumor, node and metastasis staging criteria that have progressed following prior therapy.
  • Cohort B-5: Patients with triple-negative breast cancer confirmed negative for estrogen receptor (ER) and progesterone receptor (PR) and negative for human epidermal growth factor receptor 2 (HER2) (i.e., triple-negative) that have progressed following prior therapy.
  • Cohort B-6: Patients with histologically confirmed non-small cell lung cancer (NSCLC) with no actionable mutations, such as Epidermal Growth Factor Receptor (EGFR) mutation, anaplastic lymphoma kinase (ALK) fusion oncogene, or ROS1 that have progressed following prior therapy.
  • Cohort B-7: Locally advanced or metastatic, histologically confirmed urothelial (transitional cell) carcinoma, ineligible for cisplatin, no prior systemic anticancer treatment for advanced urothelial carcinoma.
  • Cohort B-8: Locally advanced (unresectable) or metastatic, histologically confirmed breast cancer, either TNBC or hormone receptor (HR) positive and HER-2 negative according to ASCO/CAP guidelines and up to 3 prior lines of therapy for advanced (unresectable) or metastatic disease.
  • Cohort B-9: Histologically confirmed advanced/metastatic squamous or non-squamous NSCLC, negative for oncogenic driver mutations (EGFR, KRAS, ALK, BRAF, MET, ERRB2).
  • Cohort C renal insufficiency cohort: Patients with histologically documented urothelial carcinoma, ovarian, triple negative breast, or non-small cell lung cancer that have been previously treated with a locally approved therapy.
  • Part D supplementary PK: Patients must have histologically confirmed urothelial (transitional cell) carcinoma (patients with squamous differentiation or mixed cell types are eligible); ovarian; triple-negative breast; or non-small cell lung cancer that have been previously treated with a locally approved therapy.

Key Exclusion Criteria (all patients):

  • Clinically relevant troponin elevation
  • Uncontrolled diabetes
  • Known active or untreated CNS and/or carcinomatous meningitis
  • Grade ≥2 peripheral neuropathy
  • Active keratitis or corneal ulcerations
  • Patients with uncontrolled hypertension
  • History of another malignancy within 3 years before first dose of BT8009 or residual disease from a previously diagnosed malignancy (with some exceptions).
  • Active systemic infection requiring therapy, or fever within the last 14 days prior to first dose of BT8009.
  • Prior Stevens-Johnson syndrome/toxic epidermal necrolysis on any MMAE-conjugated drug
  • Parts A-2 and B-7 Pembrolizumab Combination Cohorts:
  • Prior organ transplant (including allogeneic)
  • Diagnosis of clinically relevant immunodeficiency
  • History of interstitial lung disease
  • Parts B-2 and B-3: Prior treatment with enfortumab vedotin Other protocol-defined Inclusion/Exclusion criteria may apply
  • Parts B-8 and B-9: Prior treatment with an ADC containing an MMAE (vedotin) payload.

Treatment and study plan

BT8009

Drug

Bicyclic 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.

Pembrolizumab

Drug

Participants in Cohorts A-2 and B-7 will receive 200 mg IV over 30-minute infusion of pembrolizumab on Day 1 of each Q3W.

Other names: Keytruda

Primary outcomes

  1. 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.

    Time frame: 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.

  2. Parts A-1 and A-2 (escalations): Number of participants with dose limiting toxicities on BT8009 as a monotherapy or in combination with pembrolizumab

    Time frame: 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.

  3. 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.

    Time frame: 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.

  4. Part D: Maximum plasma concentration (Cmax) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy

    Time frame: 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.

  5. Part D: Minimum plasma concentration (Cmin) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy

    Time frame: 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

  6. Part D: Area under the plasma concentration-time curve (AUC) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy

    Time frame: 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.

  7. Part D: Elimination half-life (t1/2) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy

    Time frame: 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.

  8. 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.

    Time frame: 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 outcomes

  1. 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.

    Time frame: 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)

    Number of participants with advanced solid tumor malignancies associated with Nectin-4 expression receiving BT8009 as a monotherapy or in combination with pembrolizumab who experience treatment-emergent adverse events using CTCAE v5.0 criteria.

  2. Part B: Duration of Response time to assess preliminary anti-tumor activity of BT8009 as a monotherapy or in combination with pembrolizumab

    Time frame: Every 8 weeks for 12 months then every 12 weeks thereafter until disease progression or, death, or up to three years

    Duration of objective response (complete or partial response) by RECIST 1.1 in participants receiving BT8009 as a monotherapy or in combination with pembrolizumab

  3. Part B: Clinical benefit rate to assess the clinical activity of BT8009 as a monotherapy or in combination with pembrolizumab

    Time frame: 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

    Proportion of participants who have complete response (CR), partial response (PR), or stable disease (SD) for at least 16 weeks according to RECIST Version 1.1 criteria.

  4. Part B: Progression-free survival time to assess the clinical activity of BT8009 as a monotherapy or in combination with pembrolizumab.

    Time frame: Every 8 weeks for the first 12 months then every 12 weeks until disease progression or death for up to three years

    The time from the first day of study drug administration (Day 1) to disease progression according to RECIST 1.1 criteria in participants receiving BT8009 as a monotherapy or in combination with pembrolizumab.

  5. Part B: Overall survival time to assess the clinical activity of BT8009 as a monotherapy or in combination with pembrolizumab using RECIST 1.1

    Time frame: Every 8 weeks for the first 12 months then every 12 weeks until death, then every 3 months for up to 1 year after last patient accrued

    The time from start of study drug administration (Day 1) until death due to any cause in participants receiving BT8009 as a monotherapy or in combination with pembrolizumab.

  6. Cohorts B-4, B-5, and B-6: Objective response rate by Nectin-4 status of BT8009 as a monotherapy in patients with selected solid tumor using RECIST 1.1.

    Time frame: Every 8 weeks for the first 12 months then every 12 weeks until disease progression or death for up to three years

    Proportion of participants with confirmed complete response or partial response to BT8009 as a monotherapy according to RECIST 1.1 criteria categorized by Nectin-4 expression status.

  7. Parts A-1, A-2, B-8, B-9, and C: Objective response rate to assess preliminary anti-tumor activity of BT8009 as a monotherapy or in combination with pembrolizumab.

    Time frame: Every 8 weeks for the first 12 months then every 12 weeks until disease progression or death or up to three years

    Proportion of participants with advanced solid tumor malignancies associated with Nectin-4 expression or advanced solid tumor malignancies having renal insufficiency with confirmed complete response or partial response according to RECIST 1.1 criteria

  8. Parts A-1, A-2, C and D: Duration of Response time to assess preliminary anti-tumor activity of BT8009 as a monotherapy or in combination with pembrolizumab.

    Time frame: Every 8 weeks for the first 12 months then every 12 weeks until disease progression or death or up to three years

    Duration of objective response (complete or partial response) by RECIST 1.1 in participants with advanced solid tumor malignancies associated with Nectin-4 expression or advanced solid tumor malignancies having renal insufficiency receiving BT8009 as a monotherapy or in combination with pembrolizumab.

  9. Parts A-1, A-2, C and D: Clinical benefit rate to assess preliminary anti-tumor activity of BT8009 as a monotherapy or in combination with pembrolizumab

    Time frame: Every 8 weeks for the first 12 months then every 12 weeks until disease progression for up to 3 years

    Proportion of participants with advanced solid tumor malignancies associated with Nectin-4 expression or advanced solid tumor malignancies having renal insufficiency who have complete response (CR), partial response (PR) or stable disease (SD) for at least 16 weeks according to the RECIST Version 1.1 criteria.

  10. Parts A-1, A-2, C and D: Progression-free survival time (months) to assess preliminary anti-tumor activity of BT8009 as a monotherapy or in combination with pembrolizumab

    Time frame: Every 8 weeks for the first 12 months then every 12 weeks until disease progression or death for up to three years

    The time from start of study drug administration until disease progression according to RECIST 1.1 in participants with advanced solid tumor malignancies associated with Nectin-4 expression or advanced solid tumor malignancies having renal insufficiency receiving BT8009 as a monotherapy or in combination with pembrolizumab.

  11. Parts A-1, A-2, C and D: Overall survival time (months) to assess preliminary anti-tumor activity of BT8009 as a monotherapy or in combination with pembrolizumab.

    Time frame: Every 8 weeks for the first 12 months then every 12 weeks until disease progression, then every 3 months for up to 1 year after last patient is accrued

    The time from start of study drug administration until death due to any cause in participants with advanced solid tumor malignancies associated with Nectin-4 expression or advanced solid tumor malignancies having renal insufficiency receiving BT8009 as a monotherapy or in combination with pembrolizumab.

  12. Part A, B and C: Maximum plasma concentration (Cmax) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy and in combination with pembrolizumab.

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Plasma concentrations of BT8009 and MMAE from all participants taking BT8009 alone and in combination with pembrolizumab.

  13. Part A, B and C: Minimum plasma concentration (Cmin) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy and in combination with pembrolizumab.

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Plasma concentrations of BT8009 and MMAE from all participants taking BT8009 alone and in combination with pembrolizumab.

  14. Part A, B and C: Area under the plasma concentration-time curve (AUC) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy and in combination with pembrolizumab.

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Plasma concentrations of BT8009 and MMAE from all participants taking BT8009 alone and in combination with pembrolizumab.

  15. Part A, B and C: Elimination half-life (t1/2) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy and in combination with pembrolizumab.

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Plasma concentrations of BT8009 and MMAE from all participants taking BT8009 alone and in combination with pembrolizumab.

  16. Part C: Maximum plasma concentration (Cmax) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy.

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Plasma concentrations (for impact of renal impairment) of BT8009 and MMAE from Part C participants taking BT8009 as a monotherapy.

  17. Part C: Minimum plasma concentration (Cmin) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherap.

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Plasma concentrations (for impact of renal impairment) of BT8009 and MMAE from Part C participants taking BT8009 as a monotherapy.

  18. Part C: Area under the plasma concentration-time curve (AUC) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy.

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Plasma concentrations (for impact of renal impairment) of BT8009 and MMAE from Part C participants taking BT8009 as a monotherapy.

  19. Part C: Elimination half-life (t1/2) of BT8009 and monomethyl auristatin E (MMAE) when given as monotherapy.

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Plasma concentrations (for impact of renal impairment) of BT8009 and MMAE from Part C participants taking BT8009 as a monotherapy.

  20. All cohorts: Number of participants positive for anti-drug antibodies (ADA) to determine incidence of ADA

    Time frame: From Cycle 1 Day 1 through end of treatment or for up to 1 year (Cycles are 21 days or 28 days depending on the assigned dosing schedule)

    Number of participants positive for anti-drug antibodies (ADA) from all participants receiving BT8009 as a monotherapy or in combination with pembrolizumab

  21. Part D: Number of participants with treatment emergent adverse events receiving BT8009 as a monotherapy to assess safety and tolerability in participants with normal renal function or mild renal insufficiency.

    Time frame: From cycle 1 day 1 until at least 30 days after the end of treatment

    Number of participants with advanced solid tumor malignancies associated with Nectin-4 expression receiving BT8009 with normal renal function or mild renal insufficiency who experience treatment-emergent adverse events using CTCAE v5.0 criteria.

Sponsors and collaborators

Lead sponsor

BicycleTx Limited

Industry

Registry information

Official study title

Phase I/II Study of the Safety, Pharmacokinetics, and Preliminary Clinical Activity of BT8009 in Patients With Nectin-4 Expressing Advanced Malignancies

Important dates

Study start
2020
Primary completion
2026
Study completion
2026
First posted
Sep 23, 2020
Registry last updated
Nov 14, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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