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.
When a highly effective therapy like EV Pembro was approved for 'cisplatin ineligible' patients, the definition of 'ineligible' became very elastic in practice. This demonstrates that when a new treatment is seen as transformative, clinicians find ways to qualify patients, putting pressure on established guidelines.
The InVigor11 study was the first to show that detecting recurrence via a ctDNA test before it's visible on scans is not just a prognostic sign, but an actionable clinical state. Intervening with therapy at this early stage was proven to improve patient outcomes, establishing a new paradigm for cancer surveillance.
For bladder cancer patients with micrometastatic disease, the standard cystectomy requires a significant delay for the operation and recovery. This window may allow unseen metastases to progress, suggesting that upfront, effective systemic therapy is more critical for survival than immediate major surgery.
With highly effective neoadjuvant therapies now available, the surgeon's role in muscle-invasive bladder cancer is evolving. They are moving from being the primary decider and treater to being a key manager of a 'perioperative bundle,' where their first goal is often to get patients to medical oncology for systemic treatment.
In muscle-invasive bladder cancer, cisplatin ineligibility is frequently due to renal insufficiency caused by large, aggressive tumors obstructing the ureter. This redefines this patient group as having more advanced local disease, rather than simply being unfit for chemotherapy, explaining their poor outcomes with surgery alone.
While a positive ctDNA test clearly signals the need for adjuvant therapy, a negative result is less actionable for deciding initial treatment. The key prognostic value comes from being *serially* undetectable over time, information that is not available when the immediate post-surgery treatment decision must be made.
An expert oncologist identified a pathological complete response (pCR) rate over 50% as the benchmark that would fundamentally alter treatment. The EV Pembro trial's 57% pCR rate crossed this threshold, forcing a shift from a surgery-centric model toward bladder preservation strategies and systemic therapy.