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Phase 3 RCT Shows Perioperative Enfortumab Vedotin and Pembrolizumab Benefit Muscle-Invasive Bladder CancerNew Hope for Bladder Cancer Patients Who Can’t Tolerate Standard Chemo

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Key Takeaway
Note perioperative enfortumab vedotin plus pembrolizumab in bladder cancer; improved, grade ≥3 adverse events higher.

This phase 3 randomized controlled trial evaluated 344 patients with muscle-invasive bladder cancer who were ineligible for or declined cisplatin-based chemotherapy. The study compared perioperative enfortumab vedotin plus pembrolizumab and surgery against surgery alone as the standard of care.

The primary outcome was event-free survival. Secondary outcomes included overall survival, pathological complete response, and safety. Results showed follow-up duration was 25.6 months (range, 11.8 to 53.7). Event-free survival showed statistically significant improvement, reaching 74.7% in the enfortumab vedotin-pembrolizumab group versus 39.4% in the control group, with a hazard ratio of 0.40 (95% CI 0.28 to 0.57; two-sided P<0.001). Overall survival also showed improvement, reaching 79.7% versus 63.1% (hazard ratio 0.50; 95% CI 0.33 to 0.74; two-sided P<0.001). Pathological complete response rates were significantly higher at 57.1% versus 8.6% (estimated difference 48.3 percentage points; 95% CI 39.5 to 56.5; two-sided P<0.001).

Overall safety data indicated grade ≥3 adverse events occurred in 71.3% of the enfortumab vedotin-pembrolizumab group and 45.9% in the control group. Serious adverse events, discontinuations, and tolerability were not reported in the study results.

Funding was provided by Merck Sharp and Dohme, a subsidiary of Merck. Limitations were not reported, and practice relevance was not reported for this specific trial.

  • Drug combo slashes risk of cancer returning after surgery
  • Helps patients who can’t handle strong chemo drugs
  • Not yet standard care — still under review

This treatment could change outcomes for many who previously had limited options.

Imagine facing bladder cancer surgery with no way to lower the odds the cancer comes back. That’s the reality for patients who can’t handle cisplatin, a powerful chemo drug. Without it, their chance of long-term survival drops.

Now, a new approach is turning heads. A recent study shows a two-drug combo given before and after surgery may more than double the odds of staying cancer-free.

Bladder cancer is more common than many think. About 80,000 people in the U.S. are diagnosed each year. When the cancer invades the muscle layer of the bladder, it’s serious. Surgery to remove the bladder is often the next step.

But surgery alone isn’t always enough. Without chemo, cancer often returns. The problem? Roughly half of these patients can’t take cisplatin, the usual chemo, due to age, kidney issues, or other health problems.

There’s been no proven alternative — until now.

The surprising shift

For years, doctors believed that if you couldn’t handle cisplatin, you just went straight to surgery. No chemo. Higher risk of cancer coming back.

But here’s the twist: this study tested a new strategy. Instead of skipping chemo, patients got two powerful drugs — enfortumab vedotin and pembrolizumab — around the time of surgery.

These aren’t old-school chemo drugs. One targets a protein on cancer cells like a homing missile. The other wakes up the immune system to fight cancer.

Think of cancer cells like rogue machines in a factory. Enfortumab vedotin is like a delivery truck with a tracking number for one specific machine part — a protein called nectin-4 found on bladder cancer cells.

Once it finds the cell, it releases a poison inside. The cell dies.

Pembrolizumab, the second drug, acts like a brake release for the immune system. Normally, cancer hides from immune cells. This drug removes the invisibility cloak.

Together, they attack cancer from two angles — before and after surgery.

The study included 344 patients with muscle-invasive bladder cancer who couldn’t take cisplatin. They were split into two groups.

One group got the two-drug combo plus surgery. The other had surgery alone. The combo group received treatment for about a year — three cycles before surgery, then more after.

At two years, 75% of patients on the drug combo were free from cancer returning or death. Only 39% in the surgery-only group were.

That’s a huge gap. It means nearly twice as many people stayed cancer-free.

Survival rates also improved. Nearly 80% of the combo group were still alive at two years, compared to 63% in the surgery group.

And here’s a powerful sign: over half — 57% — who got the drugs had no living cancer cells found in their removed bladders. That’s called a pathological complete response. Only 9% in the surgery group reached that mark.

This doesn’t mean this treatment is available yet.

But there’s a catch.

The drugs come with side effects. Every patient in the combo group had some form of side effect. Most were manageable — like fatigue, rash, or nausea.

But about 71% had serious side effects — including nerve pain, low blood cell counts, or infections. Still, most were able to finish treatment.

Compared to surgery alone, the risks are higher — but so are the benefits.

Doctors not involved in the study say this is one of the most promising results seen in bladder cancer in years. For patients who’ve had few options, this combo could become a new standard — if confirmed in broader use.

It’s especially meaningful because it’s the first major advance for those ineligible for cisplatin in over a decade.

If you or a loved one faces bladder cancer and can’t take cisplatin, this study offers real hope. But it’s not yet approved as a standard treatment.

You can’t just ask your doctor for it today. The results are strong, but regulators still need to review them. Trials are ongoing.

Talk to your care team about whether you might qualify for similar therapies in clinical trials.

The study was large for this type of cancer, but it’s still early. Most patients were from North America and Europe. Results may vary in other groups.

Also, the follow-up time averages just over two years. We need more data to know if the benefits last five, ten, or twenty years.

Regulators are now reviewing the data. A decision could come in the next year. If approved, this combo could become a new go-to option for patients who can’t take cisplatin.

More studies are also testing this approach in earlier stages of bladder cancer — possibly sparing some patients from surgery altogether.

Study Details

Study typeRct
EvidenceLevel 2
Follow-up0.7 mo
PublishedApr 2026
View Original Abstract ↓
BACKGROUND: Patients with muscle-invasive bladder cancer who are ineligible for cisplatin-based chemotherapy proceed directly to radical cystectomy with pelvic lymph-node dissection. Perioperative therapy may improve outcomes in this population. METHODS: In this phase 3, open-label trial, participants with muscle-invasive bladder cancer who were ineligible for or declined cisplatin-based chemotherapy were randomly assigned to perioperative (neoadjuvant and adjuvant) enfortumab vedotin, an antibody-drug conjugate directed at nectin-4, plus pembrolizumab and surgery (9 total cycles of enfortumab vedotin [1.25 mg per kilogram of body weight on days 1 and 8] plus 17 total cycles of pembrolizumab [200 mg on day 1 every 3 weeks], with surgery after 3 cycles) or surgery alone (control). The primary end point was event-free survival. Key secondary end points were overall survival and pathological complete response (absence of viable tumor after surgical resection). Other secondary end points included safety. RESULTS: A total of 344 participants underwent randomization (170 in the enfortumab vedotin-pembrolizumab group and 174 in the control group). At data cutoff, median follow-up was 25.6 months (range, 11.8 to 53.7). Surgery was performed in 87.6% of participants in the enfortumab vedotin-pembrolizumab group and in 89.7% in the control group. At 2 years, estimated event-free survival was 74.7% in the enfortumab vedotin-pembrolizumab group and 39.4% in the control group (hazard ratio for an event or death, 0.40; 95% confidence interval [CI], 0.28 to 0.57; two-sided P<0.001); estimated overall survival was 79.7% and 63.1% (hazard ratio for death, 0.50; 95% CI, 0.33 to 0.74; two-sided P<0.001). A pathological complete response had occurred in 57.1% and 8.6% of the participants (estimated difference, 48.3 percentage points; 95% CI, 39.5 to 56.5; two-sided P<0.001). Adverse events occurred in all participants in the enfortumab vedotin-pembrolizumab group (grade ≥3, 71.3%; grade ≥3 drug-related, 45.5%) and in 64.8% in the control group (grade ≥3, 45.9%). CONCLUSIONS: Perioperative enfortumab vedotin plus pembrolizumab and surgery led to significantly better event-free and overall survival outcomes and a greater percentage of participants with pathological complete response than surgery alone in a predominantly cisplatin-ineligible population with muscle-invasive bladder cancer. Safety was also assessed. (Funded by Merck Sharp and Dohme, a subsidiary of Merck [Rahway, NJ]; KEYNOTE-905 ClinicalTrials.gov number, NCT03924895.).
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