Results: Among 38 transgenic mice surviving beyond one year. 12 ( 9 myc and 3 myc+ ras) mice developed multiple neoplasms. Most tumors were observed as lymphoblastoma and fibrosarcoma in histological types. 结果:在存活一年以上的38只转基因小鼠中有12只(9myc和3myc+ras)发生多种肿瘤,其组织类型以成淋巴细胞瘤和纤维肉瘤居多。