NCIt definition : A pale yellow, crystalline nitrosourea that is sensitive to light and moisture and
emits toxic fumes of nitrogen oxides when heated to decomposition. Methylnitrosourea
is an alkylating agent that is primarily used for research purposes to induce tumors
and has also been studied as a chemotherapy agent for cancer treatment. Exposure to
methylnitrosourea causes dermatitis. Methylnitrosourea is reasonably anticipated to
be a human carcinogen. (NCI05);