A complex of antibiotic substances which is produced by a Japanese streptomyces and one form of which acts directly on DNA and is an effective antineoplastic agent.

丝裂霉素(几种抗生物质的复合体，由一种日本链霉菌产生，其中一种直接作用于去氧核糖核酸，是一种有效的抗肿瘤剂)。