Immunotherapy with intravesical bacillus Calmette-Guérin (BCG) has proved to be more effective than most chemotherapeutic agents in the prophylaxis and treatment of superficial bladder tumours. Side-effects, both local and systemic, are the main limitations against its use. With the aim of lowering the incidence and severity of side-effects, we started to use two vials of BCG, Connaught type, per instillation, instead of three vials, as recommended by the manufacturer. We prospectively reviewed adverse effects of BCG treatment at the lower dosage in 92 patients. Compared with other series, we found a similar incidence of adverse effects except for some local effects as haematuria which showed a higher incidence, but we also found a lower rate of tumour relapse. Four primary tumours were recorded during the study period. In our open study, a lower BCG intravesical dosage is not followed by a reduction in side-effects.
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