Radiation Therapy and Pembrolizumab in Treating Patients With Localized Urothelial Bladder Cancer

2018-02-06 15:52:11 | BioPortfolio


This randomized phase II trial studies how well radiation therapy and pembrolizumab work in treating patients with urothelial bladder cancer that is restricted to the site of origin, without evidence of spread. Radiation therapy uses high energy x-rays to kill tumor cells and shrink tumors. Monoclonal antibodies, such as pembrolizumab, may interfere with the ability of tumor cells to grow and spread. Giving radiation therapy and pembrolizumab may work better in treating urothelial bladder cancer.



I. To determine the maximally tolerated doses of hypofractionated and conventionally fractionated radiation therapy in combination with pembrolizumab and to generate an estimate of the efficacy of this regimen. (Safety Lead-in) II. To estimate the clinical complete response (CR) rate of the primary irradiated tumor in patients receiving radiotherapy and pembrolizumab. (Dose Expansion Cohort)


I. To estimate the local control rate at 6 and 12 months in each study arm. II. To estimate the distant metastases free survival at 6 and 12 months in each study arm.

III. To estimate progression free survival at 6 and 12 months in each study arm.

IV. To estimate disease-specific survival at 6 and 12 months in each study arm. V. To determine the safety of combining radiotherapy with pembrolizumab in each study arm in the dose expansion phase.


I. To assess peripheral and tumor-based biomarkers of response and resistance. II. To define the treatment-induced effects on circulating immune cells. III. To explore the remodeling of circulating T cell repertoire.

OUTLINE: Patients are randomized to 1 of 2 cohorts.

COHORT I: Patients receive pembrolizumab intravenously (IV) over 30 minutes on day 1. Treatment repeats every 3 weeks for up to 13 courses in the absence of disease progression or unacceptable toxicity. Patients also receive hypofractionated radiation therapy (RT) over 5 fractions for 14 days.

COHORT II: Patients receive pembrolizumab as in Cohort I. Patients also receive conventionally fractionated RT over 30 fractions for 52 weeks.

After completion of study treatment, patients are followed up at 30 days and then every 12 weeks for up to 24 months.

Study Design


Infiltrating Bladder Urothelial Carcinoma


Hypofractionated Radiation Therapy, Laboratory Biomarker Analysis, Pembrolizumab, Radiation Therapy


UCSF Medical Center-Mount Zion
San Francisco
United States


Not yet recruiting


University of California, San Francisco

Results (where available)

View Results


Published on BioPortfolio: 2018-02-06T15:52:11-0500

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Medical and Biotech [MESH] Definitions

Drugs used to protect against ionizing radiation. They are usually of interest for use in radiation therapy but have been considered for other, e.g. military, purposes.

Organs which might be damaged during exposure to a toxin or to some form of therapy. It most frequently refers to healthy organs located in the radiation field during radiation therapy.

Drugs used to potentiate the effectiveness of radiation therapy in destroying unwanted cells.

The ability of some cells or tissues to withstand ionizing radiation without serious injury. Tolerance depends on the species, cell type, and physical and chemical variables, including RADIATION-PROTECTIVE AGENTS and RADIATION-SENSITIZING AGENTS.

The science concerned with problems of radiation protection relevant to reducing or preventing radiation exposure, and the effects of ionizing radiation on humans and their environment.

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