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Brief Title: Perioperative Enfortumab Vedotin (EV) Plus Pembrolizumab (MK-3475) Versus Neoadjuvant Chemotherapy for Cisplatin-eligible Muscle Invasive Bladder Cancer (MIBC) (MK-3475-B15/ KEYNOTE-B15 / EV-304)

A Phase 3, Randomized, Open-label Study to Evaluate Perioperative Enfortumab Vedotin Plus Pembrolizumab (MK-3475) Versus Neoadjuvant Gemcitabine and Cisplatin in Cisplatin-eligible Participants With Muscle-invasive Bladder Cancer (KEYNOTE-B15 / EV-304)


  • Org Study ID: 3475-B15
  • Secondary ID: MK-3475-B15, KEYNOTE-B15, EV-304, jRCT2041210011, PHRR221021-005086, 2020-003106-31
  • NTC ID: NCT04700124
  • Sponsor: Merck Sharp & Dohme LLC


The purpose of this study is to assess the antitumor efficacy and safety of perioperative enfortumab vedotin (EV) plus pembrolizumab and radical cystectomy (RC) + pelvic lymph node dissection (PLND) compared with the current standard of care (neoadjuvant chemotherapy [gemcitabine plus cisplatin] and RC + PLND) for participants with MIBC who are cisplatin-eligible. The dual primary hypotheses are preoperative EV + pembrolizumab and RC + PLND (Arm A) will achieve superior pathologic complete response (pCR) rate and perioperative EV and pembrolizumab and RC + PLND (Arm A) will achieve superior event free survival (EFS) compared with neoadjuvant gemcitabine + cisplatin and RC + PLND (Arm B).

  • Overall Status
  • Start Date
    April 21, 2021
  • Phase
    Phase 3
  • Study Type


Primary Outcome 1 - Measure: Pathologic Complete Response (pCR) Rate

Primary Outcome 1 - Timeframe: Up to approximately 42 months

Primary Outcome 2 - Measure: Event-Free Survival (EFS)

Primary Outcome 2 - Timeframe: Up to approximately 5 years


  • Muscle Invasive Bladder Cancer


Inclusion Criteria:
Have a histologically confirmed diagnosis of urothelial carcinoma (UC) / muscle invasive bladder cancer (MIBC) (T2-T4aN0M0 or T1-T4aN1M0) with predominant (≥50%) urothelial histology

- Have clinically non-metastatic bladder cancer (N≤1 M0) determined by imaging (computed tomography (CT) or magnetic resonance imaging (MRI) of the chest/abdomen/pelvis

- Be deemed eligible for Radical Cystectomy (RC) + Pelvic Lymph Node Dissection (PLND)

- Have Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1

- Have adequate organ function
Exclusion Criteria:
Has a known additional malignancy that is progressing or has required active anti-cancer treatment ≤3 years of study randomization with certain exceptions

- Has received any prior systemic treatment for MIBC or non-invasive muscle bladder cancer (NMIBC - prior treatment for NMIBC with intravesical BCG/chemotherapy is permitted) or prior therapy with an anti- programmed cell death 1 (PD-1), anti-programmed cell death ligand 1/ ligand 2 (PD-L1/L2), or anti-cytotoxic T-lymphocyte-associated protein 4 (CTLA-4)

- Has ≥N2 disease or metastatic disease (M1) as identified by imaging

- Is cisplatin-ineligible, as defined by meeting any one of the cisplatin ineligibility criteria as per protocol

- Has received prior systemic anticancer therapy including investigational agents within 3 years of randomization or any radiotherapy to the bladder

- Has undergone partial cystectomy of the bladder to remove any NMIBC or MIBC

- Has received a live or live attenuated vaccine within 30 days before the first dose of study intervention

- Has a diagnosis of immunodeficiency or has a known history of human immunodeficiency virus (HIV) infection. Hepatitis B infection or known active Hepatitis C infection

- Has a known psychiatric or substance abuse disorder

- Has had an allogenic tissue/solid organ transplant

- Has ongoing sensory or motor neuropathy Grade 2 or higher

- Has active keratitis (superficial punctate keratitis) or corneal ulcerations

- Has a history of uncontrolled diabetes defined as hemoglobin A1c (HbA1c) ≥8% or HbA1c 7% to <8% with associated diabetes symptoms

Gender: All

Minimum Age: 18 Years

Maximum Age: N/A

Healthy Volunteers: No


Name: Medical Director

Role: Study Director

Affiliation: Merck Sharp & Dohme LLC

Overall Contact

Name: Medical Director

Phone: 1-888-577-8839

Email: Trialsites@merck.com


Facility Status Contact