Department;
of;
Medical;
Oncology,;
Dana-Farber;
Cancer;
Institute;
and;
Harvard;
Medical;
School,;
Boston,;
MA;
02115,;
USA;
Howard;
Hughes;
Institute,;
Chevy;
Chase,;
MD;
20815,;
USA;
RAS; 合成; 正常细胞; 治疗效果; 毒性作用; 癌细胞; 临床使用; 化疗药物;