A drug that comes from the bacterium Streptomyces and is used alone under the brand name Jelmyto to treat adults with a certain type of urothelial cancer and with other drugs to treat certain types of stomach cancer and pancreatic cancer. It is also being studied in the treatment of other types of cancer. Mitomycin damages the cell’s DNA and may kill cancer cells. It is a type of antineoplastic antibiotic and a type of alkylating agent.