Bone marrow suppression after intravesical mitomycin C treatment.

Intravesical chemotherapy has been established as a modality for the treatment and prevention of superficial bladder tumors. However, the optimal time for instillation of chemotherapy following transurethral resection is still not clear. We report on a patient with a superficial bladder tumor treated immediately after transurethral resection with relatively high dose mitomycin C. Bone marrow failure developed within 2 weeks. A possible relationship is suggested.