Method of using ureidomustine (BO-1055), a water-soluble DNA cross-linking agent, in the treatment of a cancer, selected from the group consisting of various types of human leukemia [such as acute myeloid leukemia (ALL) and acute B Lymphoblastic leukemia (B-ALL)], lymphomas, small lung cell carcinoma (SCLC), sarcomas, and others.使用脲基氮芥(BO-1055,一種水溶性DNA交聯劑)治療癌症的方法,癌症係選自由各種類型的人類白血病[例如急性骨髓性白血病(ALL)和急性B淋巴母細胞白血病(B-ALL)]、淋巴瘤、小細胞肺癌(SCLC)、肉瘤、及其他癌症所組成之群組。