Background: About 75% of urothelial bladder cancers are non-muscle invasive (NMIBC), and limited to mucosa (Ta or CIS) or sub-mucosa (T1). An increase of androgen expression and androgen receptors has a positive effect on oncogenic expression. We aimed to evaluate whether 5-alpha reductase inhibitors (5-ARI) have a role in NMIBC.
Methods: We retrospectively evaluated the clinical and pathological data of 423 patients with NMIBC who underwent transurethral bladder resection. We considered the number of resections, number of total recurrences, time of recurrences, and histopathology details. The population was classified into two groups: treated and untreated with 5-ARIs. The enrolled patients were in treatment with 5ARIs for symptomatic prostatic hyperplasia for at least 12 months. Mean follow-up time was 30.43 months.
Results: Patients treated with 5-ARIs had a lower rate of recurrence (14%) than the untreated group (37%). There was a significant difference in the mean number of recurrences between the untreated and the treated group (P=0.006). Furthermore, the treated group showed a significantly greater number of low than high grade tumors, compared to the untreated group (P≤0.05). There was a significant decrease in the number of muscle invasive tumors in treated patients (P=0.032). The recurrence-free survival rate of patients treated with 5-ARIs was significantly higher (P=0.0001).
Conclusions: Long-term treatment with 5-ARIs might reduce the risk of bladder tumor recurrence, extension of lesions and increase the recurrence-free survival rate. A long-term, randomized prospective study could definitively assess the possible role of these drugs.