Clinical experience with 5-aminolevulinic acid and photodynamic therapy for refractory superficial bladder cancer

Abstract

Purpose: We determined whether photodynamic therapy after the oral administration of 5-aminolevulinic acid in patients with superficial bladder cancer that cannot be controlled by transurethral resection and intravesical bacillus Calmette-Guerin (BCG) immunotherapy would preserve the bladder, while stopping tumor progression. Side effects of treatment were also assessed.

Materials and methods: We performed photodynamic therapy after the oral administration of 5-aminolevulinic acid in 24 patients with rapidly recurring, multifocal, BCG refractory superficial pTa-pT1 transitional cell carcinoma of the bladder and carcinoma in situ.

Results: At a median followup of 36 months (range 12 to 51) 3 of the 5 patients with carcinoma in situ and 4 of the 19 with papillary tumors were free of recurrence. Three patients were rendered disease-free by repeat photodynamic therapy with 5-aminolevulinic acid and 3 underwent cystectomy. Tumor progression was stopped in 20 of our 24 cases. Immediately after the oral administration of 5-aminolevulinic acid hypotension and tachycardia occurred in 19 and 10 patients, respectively, with previously known severe cardiovascular disease. No phototoxic skin reaction or decreased bladder capacity was observed.

Conclusions: These initial clinical results suggest that photodynamic therapy with orally administered 5-aminolevulinic acid is effective as an organ preserving procedure for treating superficial bladder cancer even in patients with bacillus Calmette-Guerin refractory carcinoma. One should be aware of hemodynamic instability after the oral administration of 5-aminolevulinic acid, particularly in patients with cardiovascular co-morbidity.