Abstract
With use of previous observations in experimental animals as a basis for comparison the cytologic and histologic changes in human patients who underwent topical chemotherapy for superficial bladder cancer were documented. Despite the potential for inhibition of deoxyribonucleic acid replication these drugs apparently act in vivo as toxic substances, causing increased exfoliation with denudation of papillary and/or flat urothelium. Multinucleation was common but confined to superficial cells. Atypical cells, such as those observed after systemic chemotherapy with cyclophosphamide, rarely were present and could be distinguished readily from neoplastic elements. Although topical chemotherapy may suppress tumor growth and progression it apparently does not eradicate the neoplastic process.
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