A drug used to treat non-Hodgkin lymphoma, advanced Hodgkin lymphoma, chronic leukemia, mycosis fungoides, and a type of lung cancer called bronchogenic carcinoma. It is also being studied in the treatment of other types of cancer. Mechlorethamine hydrochloride damages the cell's DNA and may kill cancer cells. It is a type of alkylating agent. Also called Mustargen and mustine.