Brief Title: Sasanlimab (PF-06801591) in Combination With Bacillus Calmette-Guerin (BCG) in Participants With High-Risk Non-Muscle Invasive Bladder Cancer

INTRODUCTION

• Org Study ID: B8011006
• Secondary ID: N/A
• NCT ID: NCT04165317
• Sponsor: Pfizer

DESCRIPTION

The purpose of this study is to determine the safety and effects of study drug Sasanlimab with radiation therapy (High-dose hypo-fractionated radiation therapy) prior to surgery to remove the bladder (known as radical cystectomy, [RC]) in muscle invasive bladder cancer patients. For this type of cancer, patients typically receive either chemotherapy followed by RC as the standard of care or concurrent chemotherapy and radiation therapy as another well-established option. We are studying the use of study drug with the addition of radiation therapy as an alternative combined therapy for those who are ineligible or have declined to receive the standard cisplatin- based chemotherapy because of pre-existing medical conditions like poor kidney function. Additionally, the role of radiation therapy as a combined therapy has been well studied to help boost our immune cells to attack the cancer cells.

Although the radiation therapy is approved to treat bladder cancer in the United States, Sasanlimab is an investigational drug because it has not yet been approved for the use in this country. By giving both the study drug and radiation therapy together, researchers want to see if the combined therapy before surgery works better than having the surgery by itself. Sasanlimab will be referred to as “study drug” throughout the consent.

Bladder cancer is known to inhibit your immune cells (T-Cells) from attacking it, which is an important way in which our bodies control cancer cells. Sasanlimab is an antibody (called an immune checkpoint inhibitor) that allows the T-cells to become active again. This allows the T- cells to attack and kill bladder cancer cells. Ongoing studies have shown that drugs similar to Sasanlimab can be used to achieve improvement in cancer control in the bladder (as measured by shrinking the cancer or eradicating it) before surgery.

This study is designed as a Phase II clinical trial. This means that prior to this current study, clinical trials (Phase I) have already established the optimal dose and method to deliver the study drug. At this time, we are testing if this treatment works specifically for a certain type of cancer,which is muscle invasive bladder cancer for our clinical trial. Moreover, the stage of this clinical trial will also continue to provide more information about the safety of the study drug and how the treatment affects the body.

BRIEF SUMMARY

The purpose of this study is to learn about the safety and effects of the study medicine (sasanlimab) in people with non-muscle invasive bladder cancer. This study is seeking participants whose bladder cancer is still in early stages, has not spread outside of the bladder, has been removed with surgery, and is high risk (Part A) or was previously treated with BCG (Bacillus Calmette Guerin), a standard treatment for bladder cancer (Part B).

In Part A (enrollment closed), each participant was assigned to one of three study treatment groups.

* One group is given sasanlimab and BCG at the study clinic.
* The second group is given sasanlimab and BCG at the study clinic. This group will receive BCG for the first six weeks only.
* The third group is given BCG only and will not receive sasanlimab.

In Part B of the study, each new participant will be assigned to a study treatment group based on the type of their bladder tumor.

- Both groups will be given sasanlimab at the study clinic.

On August 31, 2022, the Sponsor announced the discontinuation of enrollment to Part B. The decision to discontinue enrollment to Part B was not made for safety reasons.

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DETAILED DESCRIPTION

CREST: Combination of sasanlimab and alternative BCG Regimens to Evaluate outcomes with Subcutaneous anti-PD-1 Treatment

Phase 3 Design with two Cohorts. Cohort A consists of 3 study Arms (A, B and C) of BCG naive participants. Arms A and B consist of two study drugs, PF-06801591 plus BCG. Arm C consists of one study drug, BCG. Cohort B consists of B1 and B2, which test PF-06801591 and include participants who have BCG unresponsive CIS (B1) or BCG unresponsive papillary only disease (B2).

The study is designed to demonstrate that PF-06801591 plus Bacillus Calmette Guerin (BCG) (induction and maintenance periods) is superior to BCG alone (induction and maintenance periods) in prolonging event free survival (EFS) in participants with high-risk naïve non-muscle invasive bladder cancer (NMIBC) and to demonstrate that PF-06801591 plus BCG (induction period only) is superior to BCG alone (induction and maintenance periods) in prolonging EFS in participants with high-risk NMIBC. The study is also designed to estimate the CR rate of PF-06801591 alone in participants with BCG unresponsive CIS and to evaluate the EFS of PF-06801591 alone in participants with BCG unresponsive NMIBC.

On August 31, 2022, the Sponsor announced the discontinuation of enrollment to Part B, which enrolled participants with BCG unresponsive NMIBC. The decision to discontinue enrollment to Part B was not made for safety reasons.

• Overall Status
  Active, not recruiting
• Start Date
  December 30, 2019
• Phase
  Phase 3
• Study Type
  Interventional