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Bladder CancerSeptember 2020Summary reviewed July 2026

What the JAVELIN Bladder 100 Trial Found — Avelumab for Bladder Cancer

Researchers tested whether continuing avelumab immunotherapy after chemotherapy could help people with advanced bladder cancer live longer. Patients who received avelumab lived a median of 21.4 months compared to 14.3 months for those who stopped treatment after chemotherapy.

What the trial was testing

The JAVELIN BLADDER 100 enrolled 700 patients with bladder cancer. The study was sponsored by Pfizer and tracked outcomes across the full group of patients who matched the trial's eligibility profile.

It was a large trial designed to confirm whether the treatment works well enough for wider use. Trials at this stage are designed to produce evidence regulators and physicians can act on — not just observations to follow up later.

What the results showed

Patients who continued avelumab after chemotherapy lived 7 months longer on average.

The New England journal of medicine · 2020 · NCT02603432

These findings — that patients lived 7 months longer when continuing avelumab versus stopping treatment after chemotherapy — were published in the The New England journal of medicine and represent the headline result of the study.

Researchers tracked outcomes across 700 patients enrolled in the trial. The result was consistent enough across the group that the team felt confident reporting it.

What this means for patients

For patients with bladder cancer, this result changes the calculus on what to ask their care team about. Whether it changes day-to-day care depends on factors like disease subtype, prior treatments, and where the patient is in their care journey.

What you can do now

Avelumab is FDA-approved as maintenance therapy for advanced bladder cancer that hasn't grown after initial chemotherapy. If you've completed first-line chemotherapy for metastatic bladder cancer and your disease is stable, ask your oncologist whether continuing with avelumab maintenance is right for you.

Eligibility for the treatments mentioned above depends on specific test results and clinical history. Bring this summary, the trial name, and your most recent labs or pathology report to your next visit.