[Clinico-pathologic differences between bladder neoplasm with low malignant potential and low-grade carcinoma].

Area of Science:

• Uro-oncology
• Pathology
• Clinical Urology

Background:

• Distinguishing between papillary neoplasm of low malignant potential and low grade papillary carcinoma in bladder tumors is crucial for accurate prognostication.
• Accurate classification impacts treatment decisions and patient outcomes in superficial bladder cancer.

Purpose of the Study:

• To evaluate the clinical and survival significance of morphologic subgrouping of grade I bladder tumors.
• To determine if papillary neoplasm of low malignant potential and low grade papillary carcinoma represent distinct clinicopathologic entities.

Main Methods:

• Retrospective review and reclassification of 257 superficial bladder cancer patients using WHO/ISUP criteria.
• Statistical analysis including Fisher's test, multivariate analysis (Odds Ratio) for risk factors, and Kaplan-Meier survival estimates with log-rank test.
• Minimum 5-year follow-up for all included patients.

Main Results:

• No significant differences in age, sex distribution, or tumor multiplicity between the subgroups.
• Mean tumor size was higher in the low grade papillary carcinoma group.
• Tumor size was the sole significant risk factor for recurrence and progression; chemotherapy showed a minimal, non-significant role in recurrence.

Conclusions:

• Papillary neoplasm of low malignant potential and low grade papillary carcinoma are considered distinct pathologic entities based on clinical findings.
• Tumor size is the primary prognostic factor within these low-grade bladder tumor groups.
• Chemotherapy is not recommended for low-grade bladder tumors due to lack of demonstrated benefit and potential for recurrence.