The transformative efficacy of EV-Pembro has ushered in a new, aggressive treatment philosophy for both muscle-invasive and metastatic bladder cancer. The approach is to administer the combination upfront to gain rapid disease control, and only then make subsequent decisions about surgery, radiation, or further therapy.

Following high response rates to systemic therapies like EV Pembro, using radiation for bladder preservation is now questioned. It may constitute overtreatment by radiating a now cancer-free organ, while providing no benefit for the systemic micrometastases that are the primary driver of mortality.

Extrapolating from the metastatic setting, clinicians should anticipate that most patients on the 9-cycle perioperative EV-pembrolizumab regimen will require dose reductions or holds. Cumulative peripheral neuropathy is the primary driver, suggesting a need for proactive, individualized dose management rather than strict adherence to the trial's protocol.

Major trials in prostate (PEACE-2), bladder (Keynote B15), and kidney cancer (LITESPARK-022) showcase a common strategy: moving potent systemic therapies into earlier, curative-intent settings. This approach of using the best drugs sooner aims to improve long-term outcomes, though it also raises questions about toxicity and overtreatment.

The practice-changing Keynote B15 trial showed strong efficacy for neoadjuvant EV-Pembro. However, about half of patients discontinued treatment due to side effects. This creates a clinical paradox: patients who complete the full regimen may be over-treated, while those who stop early due to toxicity may be under-treated, complicating patient management and counseling.

Clinical Complete Response (cCR), assessed by imaging and biopsy, is the primary endpoint for avoiding surgery in new trials. However, these tools are known to be unreliable, potentially missing up to 25% of residual post-mucosal tumors and leading to undertreatment.

A key lesson in bladder cancer is that patient attrition is rapid between lines of therapy; many who relapse from localized disease never receive effective later-line treatments. This reality provides a strong rationale for moving the most effective therapies, like EV-pembrolizumab, to earlier settings to maximize the number of patients who can benefit.

The success of new treatments like immunotherapy and ADCs leads to more patients achieving a deep response. This high efficacy makes patients question the necessity of a radical cystectomy, a life-altering surgery, creating an urgent need for data-driven, bladder-sparing protocols.

With pathologic complete response rates approaching 67% in patients completing neoadjuvant EV-Pembro, a majority of cystectomies are now removing cancer-free bladders. This creates an ethical and clinical imperative to rapidly launch prospective trials to validate bladder preservation strategies and avoid overtreatment.