Exploring the Role of Granuloma Formation in the Prognosis of BCG-treated Bladder Carcinoma

Objective: Bacillus Calmette-Gurin (BCG) therapy continues to be a fundamental component in the treatment of non-muscle invasive bladder cancer.The objective of this study was to assess the relationship between granuloma formation resulting from BCG therapy and histopathological and clinical parameters. Materials and Methods:This study encompassed 96 patients who underwent intravesical BCG therapy from 1990 to 2003.Post-treatment biopsy specimens were re-evaluated for the presence of granulomas.Cases demonstrating any number of granulomas were classified as positive for granulomatous response.The presence of granulomas was analyzed in relation to various factors including age, sex, pathological tumor stage, tumor grade, and the status of tumor recurrence and progression.Results: The mean age of the cases was 64.1310.34years.The cases were predominantly male (85.4%, n=82) compared to those who were female (14.6%, n=14).Granuloma formation was identified in 39 cases (40.6%).Recurrence occurred in 48 cases (50%).Progression was observed in 11 patients (11.5%).The distribution of pathological stages was as follows: non-invasive tumors (pTa) in 70 cases (72.9%) and pT1 in 26 cases (27.1%).Tumor grading revealed 38 grade 1 cases (39.6%), 45 grade 2 cases (46.9%), and 13 grade 3 cases (13.5%).Statistical analysis revealed no significant differences between cases with and without granuloma in terms of age (p=0.703),gender (p=0.052),recurrence (p=0.301),progression (p=0.761),time to recurrence (p=0.186),survival (p=0.367) or tumor grade (p=0.353).However, a significant difference was observed in the distribution of pathological stages and the frequency of granulomas was higher in cases with pT1 (p=0.011). Conclusion:The study revealed a higher prevalence of stage pTa in patients without granulomas, suggesting that granuloma formation might be more likely in tumors that exhibit invasion.This could reflect differences in immune response elicited by BCG therapy or in biological/molecular characteristics of the tumor itself.The presence of granulomas doesn't strongly correlate with the overall prognosis.These results emphasize the need for further research to explore the mechanisms behind granuloma formation and its potential implications for treatment efficacy and patient management in more standardized case series.