Discordance between preoperative and postoperative bladder cancer location: implications for partial-bladder
Benjamin Goldsmith1, Kai Tucker, Robert Greg Conway
1Department of Radiation Oncology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Summary
Preoperative imaging frequently misses bladder tumor sites, leading to potential treatment errors. This under-detection is common, especially for solitary tumors, impacting partial-bladder radiation accuracy.
Area of Science:
- Urology
- Oncology
- Radiation Oncology
Background:
- Partial-bladder radiation is of interest for reducing toxicity in bladder cancer treatment.
- Accurate preoperative staging is crucial for selecting appropriate patients for partial-bladder techniques.
- Current preoperative examinations may not reliably identify all tumor locations within the bladder.
Purpose of the Study:
- To assess the correlation between preoperative tumor localization and postoperative findings in bladder cancer patients.
- To evaluate the accuracy of standard preoperative examinations in identifying all sites of invasive bladder transitional cell carcinoma (TCC).
- To inform the appropriate application of partial-bladder radiation techniques by understanding preoperative staging limitations.
Main Methods:
- Retrospective analysis of 222 patients with clinically staged T1-T4 invasive TCC undergoing radical cystectomy.
- Patients were categorized as "under-detected" if invasive disease (≥T1) was found postoperatively but not preoperatively.
- "Widely under-detected" status was assigned if postoperative lesions were missed preoperatively in the same or adjacent sites.
- Logistic regression was used to analyze rates of under-detection and identify associated clinical variables.
Main Results:
- A significant discordance was observed, with 96% of patients showing at least one area of discrepancy between preoperative and postoperative findings.
- 58% of patients were under-detected in at least one location, and 12% were widely under-detected.
- Solitary preoperative tumor sites were significantly associated with increased under-detection of invasive disease (OR = 4.161).
Conclusions:
- There is a substantial discrepancy between preoperative and postoperative localization of bladder tumors.
- Incomplete preoperative identification of all tumor sites can lead to "marginal misses" in partial-bladder radiation therapy.
- These findings highlight the need for improved preoperative staging to optimize bladder cancer treatment strategies.
